Anadigics, Inc.

John Thomas Bayruns

Phillip William Wallace

Raymond M Waugh

Kenneth S Sanyigo

Robert J Bayruns

Rajah Vysyaraju

Shaorui Li

Thomas D DeNigris

Julio Canelo

Charles Armour

George G Gilbert

Hakan Leblebicioglu

Michael A Rosenstock

A system and method for frequency conversion in a frequency-conversion receiver is disclosed. The frequency-conversion receiver receives input RF signals carrying multiple channels. The frequency-conversion receiver converts the input RF signals to a wide IF band. The IF band is further processed by dividing the IF band into one or more frequency segments or by selecting a wideband frequency segment from the IF band. The wideband frequency segment or the one or more frequency segments are further down-converted, filtered and amplified to provide desired output IF signals, based on the number of channels required in the output IF signals.

System and method for frequency multiplexing in double-conversion receivers

A circuit and method for tracking a local oscillator signal frequency in an RF tuner, for tuning input RF signals. The RF tuner includes a frequency-dependent impedance generator that generates a frequency-dependent impedance at the input by rejecting unwanted input RF signals and shunt feeding back the desired signal to the input. The desired signal frequency is centered at the local oscillator signal frequency. The frequency-dependent impedance generator is used with an amplifier circuit to generate a tracking amplifier, the frequency-dependent amplifier gain of which tracks the local oscillator signal frequency.

Tuning circuitry utilizing frequency translation of an impedance from a fixed-filter frequency response

The invention provides a system for providing tunable balanced loss compensation in an electronic filter. Tunable balanced loss compensation is provided by using cross-connected balanced transconductors and self-connected balanced transconductors. The cross-connected balanced transconductors and the self-connected transconductors compensate the unbalanced loss across the electronic filter. The self-connected balanced transconductors compensate the balanced loss across the electronic filter. Further, the cross-connected and the self-connected balanced transconductors are tunable by adjusting the values of their transconductances, thereby providing tunable balanced loss compensation.

Tunable balanced loss compensation in an electronic filter

The invention provides a system and method for tuning broadband signals by using post mixer I/Q equalization. An Image Rejection Mixer (IRM) is used for mixing Radio Frequency (RF) signals and rejecting image signals from the desired RF signals. The IRM includes an I/Q mixer and a filter. The I and Q paths resulting from the mixing operation in the I/Q mixer are equalized in amplitude and phase by an I/Q equalizer. Thereafter, the image signals are rejected from the desired RF signals using the filter.

Method and system for image rejection by using post mixer I/Q equalization

A single-input/multiple output power splitter having internal feedback circuitry. A separate amplifying circuit, such as a transistor, is used to drive each of the outputs. The transistors may be arranged in a common source/emitter amplifying configuration in which the gates/bases are connected together as an input node. Each transistor has an associated feedback circuit including passive circuit elements, such as resistors. The passive circuit elements are connected between the drain/collector of its corresponding transistor and a common intermediate connecting node to which all feedback resistors are also connected. The common intermediate node is connected to the single input via a separate input resistor.

Active power splitter with impedance matching

A multiple-frequency local oscillator for providing an LO signal at one of a multiple of predetermined resonant frequencies associated with a number of resonators is disclosed. It includes a number of LO input ports for coupling to a plurality of resonators, respectively, each resonator having a predetermined resonant frequency; the local oscillator is controlled to selectively provide at its LO output port an output LO signal at any one of the resonant frequencies.

Multi-frequency local oscillators

Low impedance means are provided for coupling a common circuit ground of a microwave circuit to the ground potential. The low impedance means include a plurality of resonators, each having a distinct resonant frequency at which it displays a minimum impedance. The resonant frequencies of the resonators are chosen and arranged such that the resonators together operate to provide a low impedance band in the frequency spectrum within which low impedance coupling between the common circuit ground and the ground potential is achieved. In a preferred embodiment, resonators include capacitors connected in series with inductive bonding wires, and different resonant frequencies are obtained by using capacitors with different capacitance.

Method and apparatus for providing grounding to microwave circuit by low

A plastic package for microwave applications up to 14 Ghz is disclosed. The plastic package includes a plastic platform, a lead frame embedded on the surface of the platform and, in one embodiment, a plastic cap mounted on the platform so as to seal the chip within the package. The lead frame includes a baseplate for mounting at least one semiconductor chip, at least one ground lead attached to the baseplate and extending outwardly therefrom, and at least one signal lead for conducting signals to or from such semiconductor chip. The signal lead and at least one ground lead are configured as a microwave transmission line such as microwave coplanar strips, or microwave coplanar waveguide for transmitting microwave frequency signals. The package offers a low inductance ground path, good thermal characteristics, and low parasitic inductance and capacitance. It can be applied for high speed and high frequency applications.

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Middlesex, NJ, United States of America

John Thomas Bayruns