Gain control circuit and variable gain power amplifier using sam

Details Gain control circuit and variable gain power amplifier using sam Gain control circuit and variable gain power amplifier using sam

1996-09-20

1998-04-21

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including gain control means

330145, H03G 330

Patent

active

057422060

ABSTRACT:
A gain control circuit (200) for controlling gain of a circuit (100) operative on the basis of a positive supply voltage, in accordance with strength of current pulled out by the gain control circuit from a control node (12) of the gain-controlled circuit (100), comprises: a depletion-type transistor (21) having one end (drain) connected to the control node of the gain-controlled circuit, the other end (source) connected to a voltage supply terminal (25) to which an external supply voltage is applied, and a gate terminal connected to a control signal terminal (16) to which an external positive voltage control signal is applied; and a resistance element (22) connected in parallel to both ends of the depletion-type transistor (21), for shifting a threshold voltage of the transistor in a positive direction by applying a shift voltage between both the ends of the transistor so that turn-on resistance of the transistor can be controlled on the basis of the positive voltage control signal. Here, the gain of the gain-controlled circuit (100) can be controlled by controlling strength of current pulled out from the gain-controlled circuit on the basis of the positive voltage control signal applied to the gate terminal of the transistor (21).

REFERENCES:
patent: 5327101 (1994-07-01), Neely et al.

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