Macom Technology Solutions Holdings, Inc.

Thanh T Pham

Wayne Kennan

Duy Nguyen

Trong Phan

Stefano D'Agostino

Nguyen Nguyen

Nguyen L K Nguyen

Amplifiers with temperature-adaptive gain and peaking gain control are described. In one example, a temperature-adaptive amplifier includes an amplifier, a temperature sense circuit, and a peaking control level shifter to bias shift the output of the amplifier and adjust a peaking gain of the amplifier based on the temperature control signal. The peaking control level shifter can adjust a peaking gain of the amplifier based on the temperature control signal. The temperature-adaptive control can help to compensate for peaking gain in amplifiers based on the operating temperature of the amplifier. The control can help to compensate for unwanted changes in amplifier peaking gain, over time, resulting in more consistent peaking gain over the full operating frequency range of amplifiers.

Adaptive temperature peaking control for wideband amplifiers

A distributed amplifier system comprising an impedance matching network configured to match an input impedance to an output impedance of the signal source, and a DC block configured to block DC components in the input signal. A variable gain amplifier adjusts the gain applied to the input signal based on a gain control signal to generate a gain adjusted signal. An emitter follower circuit receives and processes the gain adjusted signal to introduce gain peaking to create a modified signal. A distributed amplifier receives and amplifies the modified signal from the emitter follower circuit, to create an amplified signal. The distributed amplifier includes a termination network and one or more impedance matching elements configured for gain shaping the amplified signal. The gain peaking introduced by the emitter follower circuit is controlled by a variable current source. The distributed amplifier may be an open collector distributed amplifier.

Variable gain optical modulator with open collector driver amplifier and method of operation

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San Jose, CA, United States of America

Thanh T Pham