Output level control circuit for setting transmission output to

Details Output level control circuit for setting transmission output to Output level control circuit for setting transmission output to

1994-09-30

1995-10-17

Heyman, John S.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Amplitude control

327316, 327 73, 327538, 455126, H03L 500

Patent

active

054594260

ABSTRACT:
The present invention provides an output level control circuit for a transmitter of an automobile telephone system which can output a transmission output signal of an output level indicated by a level setting signal with a high degree of accuracy. First and second level control circuits function for a low-level side and a high-level side, respectively, of the detection output of a detection circuit and perform weighting such that the outputs vary with linearity relative to the output signal of the amplifier. A control signal generation circuit causes a selection circuit to select a first or second error signal of a first or second comparison circuit, respectively. The first and second comparison circuits receive the output of the first or second level control circuit, respectively, and these control circuits process the detection output corresponding to the output level of the output signal of the amplifier indicated by a level setting signal. An amplifier control circuit supplies the amplifier with a level control voltage in response to the first or second error signal output selected by the selection circuit and controls the amplifier so that the amplifier may output an output signal of the output level indicated by the level setting signal.

REFERENCES:
patent: 5214393 (1993-05-01), Aihara
patent: 5335369 (1994-08-01), Aisaka
patent: 5337006 (1994-08-01), Miyazaki
patent: 5381115 (1995-01-01), Timmons et al.

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