Start signal outputting circuit

Details Start signal outputting circuit Start signal outputting circuit

2007-05-08

2007-05-08

Callahan, Timothy P. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Converting input frequency to output current or voltage

C327S100000

Reexamination Certificate

active

10523352

ABSTRACT:
A start signal outputting circuit according to the invention has a differential RF/DC convertor part100for converting a high frequency power (RF) into a d.c. potential (DC). The RF/DC convertor part100is formed by two transistors QRD, QDDworking as a diode, and transistors QR1˜R3, QD1˜D3and resistances RR1˜R3for forming high resistances at anode sides and cathode sides of these diodes, respectively. A differential amplification part200disposed at a later stage of the diode has not only amplifying effect but also low-pass filtering effect together with filtering pars120, 210of its previous and later stages. In this case, it is designed so that current flowing through the respective circuits is about 2˜3 μA. As a result, even if the high frequency power of the specified frequency is weak, for example −60˜−40 dBm, a start signal outputting circuit1000which outputs a d.c. potential of 0.3˜2.4V, is suitable for integration and has a low power consumption can be obtained.

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International Search Report for PCT/JP03/12175; ISA/JPO; Dated: Dec. 9, 2003.

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