Analog Devices International Unlimited Company

Hittite Microwave Corporation

Tolga Pamir

Antonio J Montalvo

Christopher Mayer

Mark M Cloutier

David J Mclaurin

Jianxun Fan

Aritra Dey

Mostafa Haroun

Brian Reggiannini

Lu Wu

Greg Bachmanek

Ahmed Ali

Hatice Ozis Unsal

Richard Schubert

Gordon Allen

A transmitter that reduces 3order harmonic (HD3) and inter modulation distortion (IMD3) for a gm stage of a mixer while reducing flicker noise is disclosed. The transmitter may include a balanced mixer, a transconductance stage connected to the mixer, and a bias circuit. The bias circuit may include a programmable current source configured to provide a reference current. Further, the bias circuit may include a replica circuit configured to replicate a DC signal of the transconductance stage. The bias circuit may also include a bias transistor configured to level shift a bias signal obtained from a signal source based on the reference current and the DC signal of the transconductance stage as determined from the replica circuit.

Flicker noise elimination in a double balanced mixer DC bias circuit

A fast turn on compensation system for a synthesized signal source includes a synthesized signal source coupled to a power supply and configured to generate a phase stable radio frequency (RF) output signal. A mute amplifier is coupled to the synthesized signal source and the power supply. A dummy amplifier is coupled to the mute amplifier and the power supply. A mute controller is coupled to the mute amplifier and the dummy amplifier, the mute controller is responsive to an enable signal and configured to enable the dummy amplifier and disable the mute amplifier when no RF output signal is being generated and disable the dummy amplifier and enable the mute amplifier when the RF output signal is being generated such that total power supply current delivered to the synthesized signal source and the dummy amplifier or mute amplifier is approximately constant before, during, and after enabling the mute amplifier to reduce phase disturbance of the RF output signals.

Fast turn on system for a synthesized source signal

Growing community of inventors

Ottawa, Canada

Tolga Pamir