Motorola Corporation

Paul B Sofianos

Phuc C Pham

Dwight D Esgar

A gain stage for providing an automatic phase shift is provided. In particular, the gain stage detects whether an oscillation signal appears at its inputs. If an oscillation signal is not detected, then the gain stage inverts output signals occurring at outputs of a first amplifier before being respectively applied to inputs of a second amplifier. This has the overall effect of implementing a 180.degree. phase shift of a signal appearing at the outputs of the gain stage with respect to a signal appearing at the inputs of the gain stage.

Saw oscillator gain amplifier with auto phase shift

An on-chip self-test circuit has been provided that allows for accurately testing a device such as prescaler at high frequencies. The on-chip self-test circuit includes a voltage controlled oscillator for providing high frequency signals to the device under test. The on-chip self-test circuit is rendered active only when one desires to test the device. Thus, when not testing, the on-chip self-test circuit is transparent to the device and consumes substantially zero power.

Growing community of inventors

Mesa, AZ, United States of America

Paul B Sofianos