Activation signal output circuit and determination circuit
US7209842B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 26, 2003 |
| Grant date | Apr 24, 2007 |
| Priority date | — |
| Expiry date | Nov 26, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03D1/18
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A start signal output circuit having an RF/DC conversion circuit to which radio frequency power (RF) of specified frequency is inputted and from which a direct current potential (DC) is outputted, comprises a detection/amplification circuit 210 which includes a voltage doubler wave-detector circuit 10 configured including a sensing diode Q1 (Tr34) for sensing the RF power, a differential amplifier including differential pair transistors Tr31 and Tr32, and a current mirror circuit. A base current of one Tr31 of the differential pair transistors is brought into substantial agreement with a DC component of a current flowing through the sensing diode Q1 (Tr34). A total of currents flowing through the differential pair transistors Tr31 and Tr32 is regulated to a substantially constant value by the current mirror circuit. Thus, the start signal output circuit which is small in size, high in sensitivity and low in power consumption can be realized.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.