Input circuit of counter circuit, and integrated circuit for fre

Details Input circuit of counter circuit, and integrated circuit for fre Input circuit of counter circuit, and integrated circuit for fre

1997-09-04

1999-11-16

Tran, Toan

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

Having selection between plural continuous waveforms

327403, 327405, 327 44, H03K 1700

Patent

active

059864826

ABSTRACT:
A first amplifier circuit having a high frequency characteristic and a second amplifier circuit having a low frequency characteristic have first and second input terminals, respectively. The first and second amplifier circuits have first and second feedback resistors for self-bias and first and second switching elements capable of interrupting outputs of the amplifier circuits, respectively. Between the first and second input terminals, a third switching element is connected. A device for controlling on and off of the switching elements is provided in order that according to a signal input to the first and second input terminals, the signal is transmitted to either the first amplifier circuit or the second amplifier circuit. As a result, irrespective of whether the front end has one output terminal or two output terminals, the input circuit can be connected to the PLL synthesizer IC as it is by connecting the output to the first input terminal or to the two input terminals.

REFERENCES:
patent: 4333150 (1982-06-01), Matty
patent: 5751178 (1998-05-01), Shor
patent: 5838735 (1998-11-01), Khullar
patent: 5857003 (1999-01-01), Geiger

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