Attenuation cell with an attenuation factor control device

Details Attenuation cell with an attenuation factor control device Attenuation cell with an attenuation factor control device

2007-06-05

2007-06-05

Nguyen, Patricia (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S256000, C327S356000, C327S359000

Reexamination Certificate

active

11025848

ABSTRACT:
Attenuation cell comprising first and second differential pairs of bipolar transistors. A gain control device applies a voltage VA−VB between the bases of both differential pairs and comprises a set of three diodes in which a current IA, a current IB and the sum IA+IB of both preceding currents flow, respectively. The two diodes seeing current IB and IA+IB generate a voltage, respectively VB and VC, and the difference between these two voltages is used to generate a value Iz used in a control loop. A desired value Vct is transformed into information Ix, then into information Iy proportional to absolute temperature T, and an error amplifier uses information Iy−Iz and generates currents IA and IB by minimizing this difference.

REFERENCES:
patent: 5757230 (1998-05-01), Mangelsdorf
patent: 6084471 (2000-07-01), Ruth, Jr. et al.
patent: 6124761 (2000-09-01), Robinson et al.
patent: 6215989 (2001-04-01), Otaka
patent: 6452449 (2002-09-01), Saito
patent: 6456142 (2002-09-01), Gilbert
patent: 6967533 (2005-11-01), Vilhonen et al.

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