1. An apparatus comprising:
a transconductance circuit that receives an input signal and that generates a first amplified signal and a second amplified signal; and
a mixing circuit having:
a first mixer that is coupled to the transconductance circuit so as to receive the first amplified signal, wherein the first mixer mixes the first amplified signal with a mixing signal, wherein the mixing signal has a duty cycle that is a fraction of a local oscillator duty cycle;
a second mixer that is coupled to the transconductance circuit so as to receive the second amplified signal, wherein the second mixer mixes the second amplified signal with the mixing signal;
an first impedance network that is coupled each of the first and second mixers, wherein the first impedance network is adapted to have an feedback impedance;
a second impedance network that is coupled each of the first and second mixers, wherein the second impedance network is adapted to have the feedback impedance; and
a differential amplifier that is coupled to each impedance network, wherein the mixing circuit further comprises:
a first capacitor that is coupled between the transconductance circuit and the first mixer; and
a second capacitor that is coupled between the transconductance circuit and the second mixer,
wherein the first impedance network further comprises:
a first resistor that is coupled to the first mixer;
a second resistor that is coupled in series with the first resistor, wherein a collective impedance of the first and second resistors is approximately equal to the feedback impedance, and wherein the second mixer is coupled to a node between the first and second resistors; and
a first switch that is coupled in parallel to the first resistor.
2. The apparatus of claim 1, wherein the first impedance network further comprises:
a third resistor that is coupled to the first mixer;
a fourth resistor that is coupled in series with the third resistor, wherein a collective impedance of the third and fourth resistors is approximately equal to the feedback impedance, and wherein the second mixer is coupled to a node between the first and second resistors; and
a second switch that is coupled in parallel to the first resistor.
3. The apparatus of claim 1, wherein the first impedance network further comprises a first resistor having the feedback impedance and wherein the second impedance network further comprises a second resistor having the feedback impedance.
4. The apparatus of claim 3, wherein the mixing circuit further comprises a dummy path that is coupled to the second capacitor.
5. The apparatus of claim 3, wherein the differential amplifier further comprises a first differential amplifier, and wherein the dummy path further comprises:
a third mixer that is coupled to the second capacitor; and
a second differential amplifier that is coupled to the third mixer.
6. The apparatus of claim 5, wherein the fraction further comprises a first fraction, and wherein the mixing signal further comprises a first mixing signal, and wherein the third mixer mixes the second amplified signal with a second mixing signal having a duty cycle that is a second fraction of the local oscillator duty cycle.
7. The apparatus of claim 5, wherein the transistors from each of first and second mixers have a first size, and wherein the transistors from the third mixer have a second size.
8. An apparatus comprising:
a transconductance circuit that generates a first amplified signal and a second amplified signal, wherein the transconductance circuit includes:
a first current source having a first current;
a second current source having a second current, wherein the second current is K-times larger than the first current;
a first transistor that is coupled to the first current source and that receives a first bias voltage;
a second transistor that is coupled to the first transistor and that receives an input signal and a second bias voltage;
a third transistor that is coupled to the second current source and that receives first bias voltage; and
a fourth transistor that is coupled to the third transistor and that receives the input signal and the second bias voltage; and
a mixing circuit having:
a first mixer that is coupled to the transconductance circuit so as to receive the first amplified signal, wherein the first mixer mixes the first amplified signal with a mixing signal, wherein the mixing signal has a duty cycle that is a fraction of a local oscillator duty cycle;
a second mixer that is coupled to the transconductance circuit so as to receive the second amplified signal, wherein the second mixer mixes the second amplified signal with the mixing signal;
an first impedance network that is coupled each of the first and second mixers, wherein the first impedance network is adapted to have an feedback impedance;
a second impedance network that is coupled each of the first and second mixers, wherein the second impedance network is adapted to have the feedback impedance; and
a differential amplifier that is coupled to each impedance network.
9. The apparatus of claim 8, wherein the transconductance circuit further comprises:
a resistor that is coupled to the fourth transistor and that receives the second bias voltage; and
a capacitor that is coupled to the fourth transistor and that receives the input signal.
10. The apparatus of claim 8, wherein the mixing circuit further comprises:
a first capacitor that is coupled between the transconductance circuit and the first mixer; and
a second capacitor that is coupled between the transconductance circuit and the second mixer.
11. The apparatus of claim 10, wherein the first impedance network further comprises:
a first resistor that is coupled to the first mixer;
a second resistor that is coupled in series with the first resistor, wherein a collective impedance of the first and second resistors is approximately equal to the feedback impedance, and wherein the second mixer is coupled to a node between the first and second resistors; and
a first switch that is coupled in parallel to the first resistor.
12. The apparatus of claim 11, wherein the first impedance network further comprises:
a third resistor that is coupled to the first mixer;
a fourth resistor that is coupled in series with the third resistor, wherein a collective impedance of the third and fourth resistors is approximately equal to the feedback impedance, and wherein the second mixer is coupled to a node between the first and second resistors; and
a second switch that is coupled in parallel to the first resistor.
13. The apparatus of claim 10, wherein the first impedance network further comprises a first resistor having the feedback impedance and wherein the second impedance network further comprises a second resistor having the feedback impedance.
14. The apparatus of claim 13, wherein the mixing circuit further comprises a dummy path that is coupled to second capacitor.
15. The apparatus of claim 13, wherein the differential amplifier further comprises a first differential amplifier, and wherein the dummy path further comprises:
a third mixer that is coupled to the second capacitor; and
a second differential amplifier that is coupled to the third mixer.
16. The apparatus of claim 15, wherein the fraction further comprises a first fraction, and wherein the mixing signal further comprises a first mixing signal, and wherein the third mixer mixes the second amplified signal with a second mixing signal having a duty cycle that is a second fraction of the local oscillator duty cycle.
17. The apparatus of claim 15, wherein the transistors from each of first and second mixers have a first size, and wherein the transistors from the third mixer have a second size of K\u22121 times of the first size.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A golf club head, comprising:
a first part including a first side wall extending around the golf club head, wherein the first side wall ends at a first edge that defines an open side of the first part, and wherein a first interior surface of the first side wall has a draft angle of 0\xb0 or more, with respect to a first pulling direction as the first interior surface extends in a direction toward the first edge;
a second part including a second side wall extending around the golf club head, wherein the second side wall ends at a second edge that defines an open side of the second part, and wherein a second interior surface of the second side wall has a draft angle of 0\xb0 or more, with respect to a second pulling direction, as the second interior surface extends toward the second edge,
a third part including a third edge and a fourth edge;
wherein the first part and the third part are engaged with one another over at least a portion of the first edge and at least a portion of the third edge, and
wherein the second part and the third part are engaged with one another over at least a portion of the second edge and at least a portion of the fourth edge.
2. A golf club head according to claim 1, wherein the third part includes a third side wall extending around the golf club head, wherein the third side wall ends at the third edge that defines an open side of the third part, and wherein an interior surface of the third side wall has a draft angle of 0\xb0 or more, with respect to a second pulling direction, as the second interior surface extends toward the second edge.
3. A golf club head according to claim 1, wherein the first pulling direction and the second pulling direction are not parallel.
4. A golf club head according to claim 1, wherein the first part and the second part are molded parts.
5. A golf club head according to claim 4, wherein the third part is a molded part.
6. A golf club head according to claim 1, wherein the third part extends around the club head.
7. A golf club head according to claim 1, wherein the third part has a C-shape.
8. A golf club head according to claim 1, wherein the first part includes at least a portion of a ball striking face member of the golf club head at a location opposite the first edge, and wherein the second part includes a closed end opposite the second edge.
9. A golf club head according to claim 1, wherein the draft angle of the first interior surface is greater than 0\xb0, and wherein the draft angle of the second interior surface is greater than 0\xb0.
10. A golf club head according to claim 1, wherein the first part engages the third part with a lap joint, and wherein the second part engages the third part with a lap joint.
11. A golf club head, comprising:
a first part including a first side wall extending around the golf club head, wherein the first side wall ends at a first edge that defines an open side of the first part, and wherein a first interior surface of the first side wall has a draft angle of 0\xb0 or more, with respect to a first pulling direction, as the first interior surface extends in a direction toward the first edge;
a second part including a second side wall extending around the golf club head, wherein the second side wall ends at a second edge that defines an open side of the third part, wherein a second interior surface of the second side wall has a draft angle of 0\xb0 or more, with respect to a second pulling direction, as the second interior surface extends in a direction toward the second edge,
a third part engaged with the first part over at least a portion of the first edge to thereby form at least a portion of a first parting line;
wherein the second part and the third part are engaged with one another over at least a portion of the second edge to thereby form at least a portion of a second parting line; and
wherein the first part and second part are molded parts.
12. A golf club head according to claim 11, wherein the first parting line extends completely around the golf club head.
13. A golf club head according to claim 11, wherein the first pulling direction and the second pulling direction are not parallel.
14. A golf club head according to claim 11, wherein the first parting line is non-linear.
15. A golf club head according to claim 11, wherein the third part is a molded part.
16. A golf club head according to claim 11, wherein the first part engages the third part with a lap joint, and the second part engages the third part with a lap joint.
17. A golf club head, comprising:
a first part including a first side wall extending around the golf club head, wherein the first side wall ends at a first edge that defines an open side of the first part, and wherein a first interior surface of the first side wall has a draft angle of 0\xb0 or more, with respect to a first pulling direction as the first interior surface extends in a direction toward the first edge;
a second part including a second side wall extending around the golf club head, wherein the second side wall ends at a second edge that defines an open side of the second part, and wherein a second interior surface of the second side wall has a draft angle of 0\xb0 or more, with respect to a second pulling direction, as the second interior surface extends toward the second edge,
a third part includes a third edge and a fourth edge;
wherein the first part and the third part are engaged with one another over at least a portion of the first edge and at least a portion of the third edge;
wherein the second part and the third part are engaged with one another over at least a portion of the second edge and at least a portion of the fourth edge; and
wherein the first part and the second part are engaged with one another over at least a portion of the first edge and at least a portion of the second edge.
18. A golf club head according to claim 18, wherein the first part and the second part are molded parts.
19. A golf club head according to claim 19, wherein the third part is a molded part.
20. A golf club head according to claim 18, wherein the first part engages the third part with a lap joint, the second part engages the third part with a lap joint, and the first part engages the second part with a lap joint.