Mediatek Corporation

Mediatek Singapore Pte. Ltd.

Ralink Technology Corporation

Yuen Hui Chee

Osama K A Shana'a

Fei Song

Yang-Chuan Chen

Albert Chia-Wen Jerng

Osama Khalil Shanaa

Osama Shana'a

Fatih Golcuk

Osama Shanaa

An IQ generator capable of consuming lower power and occupying smaller die area. The IQ generator is configured without any synthesizer and divide-by-2 circuitry. The IQ generator may be configured to convert one or more phase outputs of a test tone generator (TTG) into I and Q signals. The IQ generator may receive as inputs differential outputs of a single phase of a TTG and/or multiple phase outputs of a TTG. The IQ generator may include one or more delay paths configured to generate the I and Q signals, and a calibration circuitry configured to compare the average pulse widths of the I and Q signals and provide one or more control signals to the one or more delay paths such that the I and Q signals are orthogonal in phase.

IQ generator for mixer

A wideband highly-linear buffer circuit exhibiting a low output impedance comprises a first PFET (PFET), a second PFET (PFET), a first NFET (NFET), and a second NFET (NFET). Sources of PFETand PFETare coupled to VDD. PFET's drain is coupled to an output lead. PFETacts as a current source. NFET's drain is coupled to PFET's drain and to PFET's gate. NFET's source is coupled to the output lead. NFET's source is coupled to ground. NFET's drain is coupled to NFET's source and to the output lead. NFET's gate is AC coupled to a first input lead. In a single-ended input example, NFET's gate is AC coupled NFET's drain. In a differential input example, NFET's gate is AC coupled to a second input lead. In another differential input example, PFETis not just a current source, but rather PFET's gate is AC coupled to the first input lead.

Wideband highly-linear low output impedance D2S buffer circuit

The isolated port of a 0/90 degree coupler is terminated by a novel complex termination impedance circuit having a reactance. The absolute value of the reactance is at least two ohms. The coupler receives a signal on its input port, and outputs a first signal on its first output port and a second signal on its second output port. A first load is coupled to the first output port without an intervening matching network. A substantial impedance mismatch exists between the first output port and the first load. A second load is coupled to the second output port without an intervening matching network. A substantial impedance mismatch exists between the second output port and the second load. Despite the substantial impedance mismatches, the first and second signals have a phase difference in a range of from 88 degrees to 92 degrees while exhibiting an amplitude imbalance less than 2 dB.

0/90 degree coupler with complex termination

A Radio Frequency (RF) front end system and method are disclosed. The RF front end system comprises an antenna, a matching network coupled to the antenna, a power amplifier (PA) coupled to the matching network via a port on a transmit path, a low noise amplifier (LNA) coupled to the matching network via the port on a receive path and at least one transmit/receive switch (T/R SW) coupled between the port and at least one of the PA and LNA.

Radio frequency front end system with an integrated transmit/receive switch

Growing community of inventors

San Jose, CA, United States of America

Yuen Hui Chee