High frequency multi-stage capacitively coupled amplifier circui

Details High frequency multi-stage capacitively coupled amplifier circui High frequency multi-stage capacitively coupled amplifier circui

1997-10-08

2000-05-16

Mottola, Steven J.

Amplifiers

With amplifier condition indicating or testing means

330310, 330145, H03F 368

Patent

active

060642564

ABSTRACT:
A coupling capacitor 21 is connected in parallel to a diode 23 between an output nord N1 of a differential amplifier circuit 10 and an input nord N3 of another differential amplifier circuit 50. In a test mode, when a test signal TC is applied to a test pad 43, a switch circuit 40 is turned on to shortcircuit a bias resistor 35 thus decreasing a bias potential at the input nord N3. This causes the diode 23 to switch on for amplifying a test low-frequency input signal IN with the differential amplifier circuit 10. By the action of the diode 23, an output of the differential amplifier circuit 10 is bypassed to the differential amplifier circuit 50. The two differential amplifier circuits 10 and 50 can thus be inspected substantially by examining an output signal OUT obtained through an output pad 56 of the differential amplifier circuit 50.

REFERENCES:
patent: 4086432 (1978-04-01), Jones

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