High CMR amplifier topology

Details High CMR amplifier topology High CMR amplifier topology

2007-11-01

2009-06-30

Choe, Henry K (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S261000

Reexamination Certificate

active

07554402

ABSTRACT:
An amplifier topology includes an input stage comprising a differential pair which conducts respective output currents in response to a differential input signal. Bias current sources provide the pair's tail current and respective bias currents for the input stage in response to a drive voltage. After flowing through the input stage, most or all of the input stage bias currents are summed at a summing node, the summed currents being a current Isum. The input stage also has a feedback loop which includes a bias generator circuit arranged to receive Isum, and to provide the drive voltage to the bias current sources such that Isumis maintained approximately constant. By so doing, the output impedance of the bias current sources is effectively increased, which serves to improve the amplifier's CMR and PSR characteristics.

REFERENCES:
patent: 4088962 (1978-05-01), Trilling
patent: 4272728 (1981-06-01), Wittlinger
patent: 4442408 (1984-04-01), Le
patent: 5276405 (1994-01-01), Mazzucco et al.
patent: 5642062 (1997-06-01), Kawakami
patent: 6661288 (2003-12-01), Morgan et al.

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