Gain block with stable internal bias from low-voltage power...

Details Gain block with stable internal bias from low-voltage power... Gain block with stable internal bias from low-voltage power...

2005-01-11

2005-01-11

Nguyen, Patricia (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including particular biasing arrangement

C330S288000, C330S291000

Reexamination Certificate

active

06842075

ABSTRACT:
A transistor bias circuit is provided that is capable of operating from a power supply voltage that is slightly higher than twice the base-emitter voltage of the transistor to be biased. The bias circuit includes a transistor connected in a current-mirror configuration with the transistor to be biased. A feedback circuit maintains the mirrored current at a constant level. The gain of the feedback circuit is improved by the addition of a non-inverting amplifier within the feedback circuit. In a preferred embodiment, the biased transistor is concurrently in both a Darlington and the current mirror configuration. Moreover, a feedback transistor in the feedback circuit is also concurrently in the Darlington configuration, thus providing an efficient biasing arrangement for an amplifier block based on the Darlington arrangement.

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Yamamoto, et al., “A 3.2-V Operation Single-Chip Dual-Band A1GaAs/GaAs HBT MMIC Power Amplifier with Active Feedback Circuit Technique” in IEEE Journal of Solid-State Circuits, Aug. 2000, pp. 1109-1120.

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