Fully switched, class-B, high speed current amplifier driver

Details Fully switched, class-B, high speed current amplifier driver Fully switched, class-B, high speed current amplifier driver

1997-05-05

1999-11-16

Tokar, Michael

Electronic digital logic circuitry

Function of and, or, nand, nor, or not

Field-effect transistor

326 83, 326 86, 326126, 327490, 330257, H03K 19094, H03K 19086, H03K 1920

Patent

active

059864796

ABSTRACT:
A current amplifier driver capable of driving both 10 Base-T signalling and 100 Base signalling in a Local Area Network (LAN) includes one constant current source. A voltage controlled switch is contained in each of four vertical segment of an H-bridge circuit. Two voltage signals are applied to the switches to control the direction of current from a constant current source across a load. When one of the voltage signals is high, the other is low and two switches of the four switches turn on. The current amplifier driver sinks the constant current in a first direction, such that a voltage drop across the output nodes is positive. When the other voltage signal is high the switches that were on turn off, and the other two switches turn on to sink the constant current across the load in the opposite direction, such that a voltage drop across the output nodes is negative. When both voltage signals are low, all four switches turn off, and the output voltage is zero. In this manner, a differential signal is generated across a resistive load.

REFERENCES:
patent: 3828206 (1974-08-01), Zuk
patent: 4825110 (1989-04-01), Yamaguchi et al.
patent: 5210236 (1993-05-01), Takayanagi
patent: 5245523 (1993-09-01), Juzswik
patent: 5444410 (1995-08-01), Polhemus
patent: 5519728 (1996-05-01), Kuo
patent: 5600280 (1997-02-01), Zhang
patent: 5635859 (1997-06-01), Yokota et al.
patent: 5767699 (1998-06-01), Bosnyak et al.

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