Current switching circuit

Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons

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Details

307355, 307544, 307559, H03K 17687, H03K 522, H03K 500, H03K 508

Patent

active

048068039

ABSTRACT:
A current switching circuit enabling current switching at a speed of several gigabits per second (Gbit/sec) or several giga Hertz (GHz) in analog integrated circuits and digital integrated circuits using GaAs FETs is so constructed that the current switching is effected by a pair of diodes, whose cathodes are connected in common and which are driven by a GaAs FET circuit (source follower circuit). This current switching circuit includes first and second FETs, each of which has a source, a drain and a gate. First and second input signals are connected to the gates of the first and the second FETs, respectively. First and second diodes are provided with anodes connected with the sources of the first and the second FETs, respectively. A constant current source is connected in common with the cathodes of the first and the second diodes, and a load circuit is connected with the drain of at least one of the first and the second FETs. By virtue of this arrangement, current flowing through the load circuit is switched, depending on the first and the second input signals, with an output signal being taken out from each load circuit.

REFERENCES:
patent: 4366567 (1982-12-01), Fukuzawa et al.
patent: 4505582 (1985-03-01), Zuleeg et al.
patent: 4612671 (1986-09-01), Giles
patent: 4647800 (1987-03-01), Meslner et al.
Katsu et al, "A GaAs Monolithic Frequency Divider Using Source Coupled FET Logic", Electron Device Letters, vol. EDL.3, No. 8, Aug. 1982.

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