1. A frequency divider comprising:
a function selector unit selecting a signal so that the selected signal in one of two feedback paths is dominantly input to a buffer unit, in synchronism with a clock signal frequency of which satisfies a certain condition;
the buffer unit buffering the signal input from the function selector unit and outputting the buffered signal;
the two feedback paths feeding back the output signal of the buffer unit to an input of the buffer unit; and
an inverter unit provided in one of the two feedback paths and inverting a signal value.
2. The frequency divider according to claim 1, wherein
the function selector comprises:
a first switch unit provided in one of the two feedback paths and turning on and off in synchronous with the clock signal in order to open and close one of the two feedback paths; and
a second switch unit provided in the other of the two feedback paths and turning on and off in an opposite timing to the first switch unit in order to open and close the other of the two feedback paths.
3. The frequency divider according to claim 1, wherein the function selector comprises:
a switch unit turning on and off in synchronous with the clock signal, wherein one of the two feedback paths is opened and closed by the switch unit while another of the two feedback paths including the inverter unit is always closed.
4. The frequency divider according to claim 2, wherein the first switch unit and the second switch unit transistor.
5. The frequency divider according to claim 1, wherein an operational delay of the inverter unit is adjustable.
6. The frequency divider according to claim 5, wherein the inverter unit comprises a variable resistor and the operational delay of the inverter unit is adjusted by changing the resistance of the variable resistor.
7. The frequency divider according to claim 1, further comprising:
a control unit turning off the inverter unit when the frequency divider is in a stand by mode.
8. The frequency divider according to claim 1, wherein
the certain condition is expressed by
1{2*(t_inv+t\u2014sw+t_buf)}<the frequency of the clock signal<min{1{2*(t\u2014sw+t_buf)},1(t_inv+t\u2014sw+t_buf)},
where t_inv is a delay time of the inverter unit, t_sw is a delay time of the function selector unit, t_buf is a delay time of the buffer unit and min{A, B} means smaller one of A and B.
9. A multiplexing system using the frequency divider according to claim 1.
10. A phase locked loop system using the frequency divider according to claim 1.
11. A clock generator using the frequency divider according to claim 1.
12. The frequency divider according to claim 3, wherein the switch unit is a transistor.
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 composite web of packaging material for forming a flexible package, comprising in combination,
a) a continuous web of substantially constant thickness packaging material, said web having width and selectable running length, said width defining the side edges of said web, and
b) a plurality of discrete strips of substantially constant thickness flexible material, each said strip having length and width, said strip width defining the strip ends, said strip length having top and bottom edges and being substantially greater than said strip width, said strip length of successive ones of each of said plurality of discrete strips being secured at package length intervals transversely to the running length of said web of packaging material along the strip top edge and being substantially unsecured along its bottom edge.
2. A composite web of packaging material for forming a flexible package as set forth in claim 1, wherein one end of each of said plurality of discrete strips is substantially congruent with one of said side edges of said web.
3. A composite web of packaging material for forming a flexible package as set forth in claim 1, wherein one end of each of said plurality of discrete strips is substantially congruent with one side edge of said web, and the other side edge of said web is disposed at a distance beyond the other end of said strips sufficient to provide a margin of web material for the formation of an overlap package seal.
4. A composite web of packaging material for forming a flexible package as set forth in claim 1, wherein both side edges of said web are disposed at a distance beyond the ends of said strips sufficient to provide side margins of web material for the formation of a package fin seal.
5. A composite web of packaging material for forming a flexible package as set forth in claim 1 wherein each of said plurality of discrete strips is secured to said packaging material substantially continuously along its top edge.
6. A composite web of packaging material for forming a flexible package as set forth in claim 1 wherein each of said plurality of discrete strips is secured to said packaging material substantially continuously along its top edge and opposite ends.
7. A composite web of packaging material for forming a flexible package as set forth in claim 1 wherein each of said plurality of discrete strips is secured to said packaging material for a short length substantially centrally along its bottom edge.
8. A composite web of packaging material for forming a flexible package as set forth in claim 1 wherein said packaging material and said plurality of discrete strips are both single thickness mono-layer materials.
9. A composite web of packaging material for forming a flexible package as set forth in claim 1 wherein said packaging material is a single thickness multi-layer material.
10. A composite web of packaging material for forming a flexible package as set forth in claim 1 wherein each of said plurality of discrete strips is a single thickness multi-layer material.
11. A composite web of packaging material for forming a flexible package as set forth in claim 1 wherein said packaging material and said plurality of discrete strips are both single thickness multi-layer materials.
12. A composite web of packaging material for forming a flexible package as set forth in claim 1 wherein each of said plurality of discrete strips is secured to said packaging material for a length along its bottom edge.