Test interface circuits with waveform synthesizers having reduce

Details Test interface circuits with waveform synthesizers having reduce Test interface circuits with waveform synthesizers having reduce

1999-04-23

2000-12-26

Ton, My-Trang Nu

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synthesizer

H03B 2100

Patent

active

06166569&

ABSTRACT:
Waveform synthesizers are disclosed that generate an output signal S.sub.OUT with independent response to a common-mode input signal S.sub.CM, an input data signal S.sub.D and a current programming signal S.sub.PRGM. The synthesizers include a differential pair of first and second transistors that respectively respond to the input data signal S.sub.D and to a fixed reference signal V.sub.REF. Because the second transistor is referenced to a fixed potential, current-pumping action of parasitic capacitances is reduced with consequent reduction of transient signals in the output signal S.sub.OUT. Signal transients are further reduced with diodes that are arranged to block transient-current interchange between the first and second transistors. To enhance synthesizer speed, known bias potentials are established in the first and second transistors by use of a keep-alive current source, a bias transistor and a bias resistor and thermal differential heating in the differential pair is reduced with cascode transistors. The synthesizers are especially suited for use in ATE interface circuits.

REFERENCES:
patent: 4303837 (1981-12-01), Ansaldi et al.
patent: 4438503 (1984-03-01), White et al.
patent: 4572971 (1986-02-01), Necoechea
patent: 4603303 (1986-07-01), Matsuno et al.
patent: 5115203 (1992-05-01), Krett et al.
patent: 5842155 (1998-11-01), Bryson et al.

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