Front-end circuit

Details Front-end circuit Front-end circuit

1996-04-12

1997-11-18

Tran, Toan

Miscellaneous active electrical nonlinear devices, circuits, and

Specific input to output function

Combining of plural signals

327 40, G06G 712

Patent

active

056892071

ABSTRACT:
A front-end circuit which receives a first input signal and a second input signal, and outputs an output signal having a differential frequency between the first input signal and the second input signal includes: a first amplifier having an input terminal, a power supply terminal and a virtual ground; a second amplifier having an input terminal, a power supply terminal and a ground; and a mixer having a first and a second input terminals, a power supply terminal and a virtual ground. In the front-end circuit, the virtual ground of the mixer is dc-coupled to the power supply terminal of the first amplifier, the virtual ground of the first amplifier is dc-coupled to the power supply terminal of the second amplifier, the power supply terminal of the first amplifier and the second amplifier are ac-coupled to the first and the second input terminals, respectively, and the input terminal of the first amplifier and the input terminal of the second amplifier receive the first and the second input signals, respectively, and a power supply voltage is supplied to the power supply terminal of the mixer and the ground.

REFERENCES:
patent: 4572975 (1986-02-01), Bowers
patent: 4845389 (1989-07-01), Pyndiah et al.
patent: 5323123 (1994-06-01), Philippe
patent: 5440261 (1995-08-01), Rydel
patent: 5444399 (1995-08-01), Shiga
patent: 5459434 (1995-10-01), Leger et al.
patent: 5517688 (1996-05-01), Fajen et al.
patent: 5528769 (1996-06-01), Berenz et al.
European Search Report for European Patent Application No. 96105708.0 mailed Jul. 15, 1996.
H. Morkner et al., 1995 IEEE MTT-S Digest, pp. 527-530, 1995 "A Novel 3V, 7mA PHEMT GaAs Active MMIC Mixer/LNA for Wireless Applications".

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