[특허]High dynamic range closed loop automatic gain control circuit

High dynamic range closed loop automatic gain control circuit 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H03G-003/30
출원번호	US-0620092 (1990-11-30)
발명자 / 주소	Wheatley III Charles E. (Del Mar CA) Punch Derek N. (San Diego CA)
출원인 / 주소	QUALCOMM Incorporated (San Diego CA 02)
인용정보	피인용 횟수 : 85 인용 특허 : 0

초록 ▼

A closed loop automatic gain control (AGC) circuit with high dynamic range capabilities having an amplifier circuit for receiving an input signal, which is susceptible to variations in signal power, and a control signal. The amplifier circuit is responsive to the control signal for amplifying the input signal at a gain level corresponding to the control signal so as to provide a corresponding output signal. A measurement circuit is coupled to the amplifier means for measuring logarithmic signal power of the amplified input signal and providing a corresponding linear measurement signal. An integration circuit is included for receiving the measurement signal, and a reference signal which corresponds to a desired signal power of the output signal. The integration circuit integrates with respect to time the difference between the measurement signal and the reference signal, and generates the control signal which corresponds to the result of the integration.

대표청구항 ▼

A closed loop automatic gain control (AGC) circuit comprising: a first amplifier having a signal input, a gain control input and an output, said first amplifier signal input capable of receiving an input signal; a filter having an input and an output, said filter input coupled to said first amplifier output; and a second amplifier having a signal input, a gain control input and an output, said first amplifier signal input coupled to said filter output; a received signal strength indicator having an input coupled to said second amplifier output, and an output; an integrator having a pair of inputs and an output, one of said integrator inputs capable of receiving a reference signal and another one of said integrator inputs coupled to said received signal strength indicator output; a compensation circuit having an input coupled to said integrator output, and an output coupled to said first and second amplifier gain control inputs.

이 특허를 인용한 특허 (85)

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Smith Douglas G. ; Dixon Robert C. ; Vanderpool Jeffrey S., Multi-band, multi-mode spread-spectrum communication system.
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Scott Logan, Timing adjustment control for efficient time division duplex communication.
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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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연합인증

High dynamic range closed loop automatic gain control circuit 원문보기

초록 ▼

대표청구항 ▼

연구과제 타임라인

이 특허를 인용한 특허 (85)

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연합인증

High dynamic range closed loop automatic gain control circuit 원문보기

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대표청구항 ▼

연구과제 타임라인

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이 특허를 인용한 특허 (85)

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