1. A start signal outputting circuit having an RFDC convertor circuit for converting a high frequency power (RF) signal into a direct current (DC) potential and outputting it, said RFDC convertor circuit comprising:
a device working as a diode for rectifying the high frequency power (RF) signal inputted on its anode;
a first transistor connected to an anode side of said diode, said first transistor working as a constant current source for supplying a constant current to the anode side of said diode by a positive potential being applied thereto; and
a second transistor inserted between a cathode side of said diode and ground, said second transistor working as a constant current source for removing a constant current from a current outputted from the cathode side of said diode by a positive potential being applied thereto.
2. A start signal outputting circuit recited in claim 1, wherein said RFDC convertor circuit further comprises a resonance circuit connected between said cathode side of said diode and ground for shorting with the high frequency power of a specified frequency.
3. A start signal outputting circuit recited in claim 1, wherein said RFDC convertor circuit further comprises a matching circuit provided on said anode side of said diode for obtaining matching with respect to an inputted high frequency power.
4. A start signal outputting circuit recited in claim 1, further comprising a counterpart circuit of the same construction as said RFDC convertor circuit, of which an anode of a device working as a diode is provided with a d.c. potential based on the positive potential given to said RFDC convertor circuit, so that a differential RFDC convertor part is formed by said RFDC convertor circuit and said counterpart circuit.
5. A start signal outputting circuit recited in claim 4, further comprising:
a differential amplification part for carrying out a differential amplification of at least one stage for an output of said differential RFDC convertor part; and
a low-pass filter disposed at least one of between said differential RFDC convertor part and said differential amplification part and a later stage of said differential amplification part,
wherein outputs of said differential amplification part and low-pass filter transmit a band of below 11000 compared to a band of said high frequency power signal.
6. A start signal outputting circuit recited in claim 5, wherein a transfer function of a part composed of said low-pass filter and said differential amplification part has a characteristic of monotonous decrease with frequency of a high frequency signal.
7. A start signal outputting circuit having an RFDC convertor circuit for converting a high frequency power (RF) into a direct current potential (DC) and outputting it, said RFDC convertor circuit comprising:
a device working as a diode;
a first npn transistor having its emitter connected to an anode side of said diode and its base and collector to which a predetermined positive potential is applied;
a second npn transistor having its collector connected to a cathode side of said diode and its emitter connected to ground via a resistance;
a third npn transistor having its emitter connected to a base of said second npn transistor and its base and collector to which a predetermined positive voltage is applied; and
a resonance circuit connected between said cathode side of said diode and ground for shorting a specified frequency.
8. A start signal outputting circuit recited in claim 7, wherein said RFDC convertor circuit further comprises a matching circuit provided on said anode side of said diode for obtaining matching with respect to an inputted high frequency power.
9. A start signal outputting circuit recited in claim 8, further comprising:
a differential amplification part for carrying out a differential amplification of at least one stage for an output of said differential RFDC convertor part; and
a low-pass filter disposed at least one of between said differential RFDC convertor part and said differential amplification part and a later stage of said differential amplification part,
wherein outputs of said differential amplification part and low-pass filter transmit a band of below 11000 compared to a band of said high frequency power signal.
10. A start signal outputting circuit recited in claim 8, wherein a transfer function of a part composed of said low-pass filter and said differential amplification part has a characteristic of monotonous decrease with frequency of a high frequency signal.
11. A start signal outputting circuit recited in claim 7, further comprising a counterpart circuit of the same construction as said RFDC convertor circuit, of which an anode of a device working as a diode is provided with a d.c. potential based on the positive potential given to said RFDC convertor circuit, so that a differential RFDC convertor part is formed by said RFDC convertor circuit and said counterpart circuit.
12. A start signal outputting circuit recited in claim 11, further comprising:
a differential amplification part for carrying out a differential amplification of at least one stage for an output of said differential RFDC convertor part; and
a low-pass filter disposed at least one of between said differential RFDC convertor part and said differential amplification part and a later stage of said differential amplification part,
wherein outputs of said differential amplification part and low-pass filter transmit a band of below 11000 compared to a band of said high frequency power signal.
13. A start signal outputting circuit recited in claim 11, wherein a transfer function of a part composed of said low-pass filter and said differential amplification part has a characteristic of monotonous decrease with frequency of a high frequency signal.
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 method comprising:
determining when a destination has been reached at least by sensing a loss of communication between a mobile communications device and a vehicle based communications device, wherein the destination has been reached by at least one of the mobile communications device, a user, or a vehicle of the vehicle based communications device; and
based at least on the sensing of the loss of communication:
determining a location of the destination;
determining a time of arrival at the location;
storing the time of arrival at the location;
ascertaining a description of what is situated at the location of the destination; and
storing a description of what is situated at the location of the destination.
2. The method of claim 1, wherein the communication is a short range wireless communication.
3. The method of claim 1, wherein the determining when the destination has been reached further includes sensing when a key has been removed from the vehicle.
4. The method of claim 1, wherein the ascertaining the description of what is situated at the location of the destination includes referring to a map database.
5. The method of claim 1, wherein the determining the time of arrival at the location includes determining a date of arrival at the location.
6. The method of claim 1, further comprising:
determining a time of departure from the location; and
storing the time of departure from the location.
7. The method of claim 6, wherein the determining the time of departure from the location includes sensing a resumption of communication between the mobile communications device and the vehicle based communication device.
8. The method of claim 1, further comprising retrieving the description of what is situated at the location of the destination.
9. The method of claim 1, further comprising retrieving the time of arrival at the location of the destination.
10. A non-transitory computer-readable storage medium comprising instructions that are executable and when executed cause a computing system to:
determine when a destination has been reached at least by sensing a loss of communication between a mobile communications device and a vehicle based communications device, wherein the destination has been reached by at least one of the mobile communications device, a user, or a vehicle of the vehicle based communications device; and
based at least on the sensing of the loss of communication, the instructions are executable and when executed cause the computing system to:
determine a location of the destination;
determine a time of arrival at the location;
store the time of arrival at the location;
ascertain a description of what is situated at the location of the destination; and
store a description of what is situated at the location of the destination.
11. The non-transitory computer-readable storage medium of claim 10, wherein the communication is a short range wireless communication.
12. The non-transitory computer-readable storage medium of claim 10, wherein the instructions when executed further cause the computing system to determine when the destination has been reached at least by sensing when a key has been removed from the vehicle.
13. The non-transitory computer-readable storage medium of claim 10, wherein the instructions when executed further cause the computing system to ascertain the description of what is situated at the location of the destination by referring to a map database.
14. The non-transitory computer-readable storage medium of claim 10, wherein the instructions when executed further cause the computing system to determine the time of arrival at the location by determining a date of arrival at the location.
15. The non-transitory computer-readable storage medium of claim 10, wherein the instructions when executed further cause the computing system to further:
determine a time of departure from the location; and
store the time of departure from the location.
16. The non-transitory computer-readable storage medium of claim 15, wherein the instructions when executed further cause the computing system to determine the time of departure from the location by sensing a resumption of communication between the mobile communications device and the vehicle based communication device.
17. The non-transitory computer-readable storage medium of claim 10, wherein the instructions when executed further cause the computing system to further retrieve the description of what is situated at the location of the destination.
18. The non-transitory computer-readable storage medium of claim 10, wherein the instructions when executed further cause the computing system to further retrieve the time of arrival at the location of the destination.