Amplitude varying driver circuit and test apparatus

Details Amplitude varying driver circuit and test apparatus Amplitude varying driver circuit and test apparatus

2007-02-20

2007-02-20

Hirshfeld, Andrew H. (Department: 2858)

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

C326S089000, C327S052000, C327S306000

Reexamination Certificate

active

10976354

ABSTRACT:
There is provided an amplitude varying driver circuit operable to output an output signal, which is an amplified input signal being supplied. The amplitude varying driver circuit includes: a plurality of differential amplifiers provided in parallel with one another, wherein a signal corresponding to the input signal is input into each base terminal thereof; a resistor section, which is provided in series with the plurality of differential amplifiers, operable to establish potential of the output signal according to total current flowing to the plurality of differential amplifiers; and an amplitude control transistor, which is provided in series with the plurality of differential amplifiers, operable to define total current flowing to the plurality of differential amplifiers.

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International Search Report dated Feb. 7, 2006 issued in International Application No. PCT/2005/018711, 7 pages, with English translation (2 pages).

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