Lattice Semiconductor Corporation

Qiming Wu

Kai Zhou

Kai Lei

Kexin Luo

Fei Song

Min-Kyu Kim

Gijung Ahn

Zhi Wu

Xiaofeng Wang

Yu Shen

Shinje Tahk

Yibin Fu

Qi Zhou

Bing Zhang

Yi Gao

Rui Yin

Jiandong Ke

Jie Yuan

A voltage controlled oscillator (VCO) is disclosed. The VCO includes an amplifier that receives a control signal and a feedback signal and generates an amplified output signal based on the difference between the control signal and the feedback signal. The VCO also includes circuitry to generate an oscillating output signal based on the amplifier output signal. Additionally, the VCO includes a feedback amplifier that generates the feedback signal based on the output of the amplifier. The feedback amplifier includes a first resistor connected in parallel with a second resistor, the second resistor having an adjustable resistance.

Spectrum shaping voltage to current converter

Embodiments relate to a voltage oscillator (VCO) that uses a replica bias circuit to generate a cascode bias voltage. The VCO generate an output periodic signal having a frequency and phase that is less or not susceptible to voltage swings by using a bias voltage generated in a replica bias circuit that replicates a voltage-to-current converter in the VOC. The bias voltage is generated and regulated according to a power supply voltage that supplies power to the VCO to account for voltage variations in the power supply voltage.

Replica cascode bias voltage-controlled oscillators

Systems, devices and methods for analog echo cancellation for high speed full duplex data transmissions, which include a first set of differential nodes to receive reception data and transmission data, a second set of differential nodes to receive the transmission data, and a subtraction circuit to receive data from the first set of differential nodes and data from the second set of differential nodes. The subtraction circuit includes a plurality of capacitors to receive data from each of the first and second sets differential nodes, and a termination circuit for providing DC termination voltage to subtract the data of the second set of differential nodes from the data of the first set of differential nodes to eliminate echo from the reception data received at the first set differential nodes.

Echo cancellation for high speed full duplex data transmissions

Embodiments of the present disclosure relate to methods and device for receiving PAM data stream. In an embodiment, a method comprises receiving a signal stream modulated with pulse amplitude modulation (PAM) associated with a plurality of bit patterns; determining boundary voltages for the plurality of bit patterns; and calibrating, based on the boundary voltages, a threshold voltage for use in recognition of the plurality of bit patterns. In this way, bit patterns may be accurately recognized based on the calibrated threshold voltage.

Methods and devices for data demodulation

A method that calibrates a device for echo cancellation and a device with calibration for echo cancellation are provided. Devices may be calibrated such that the echo residual error is less than a threshold determined by the calibration accuracy. Non-ideal factors such as mismatch may be eliminated during calibration.

Calibration for echo cancellation in a full duplex communication system

Embodiments relate to enhancing echo cancellation in a transceiver integrated circuit (IC) for full-duplex communication by providing a signal path connected to a dummy driver that replicates a signal path between a main driver and a counterpart transceiver IC to cause a duplicated signal generated by the dummy driver to more closely replicate a sending signal generated by the main driver. The signal path connected to the dummy driver includes circuit elements having transmission line parameters and RLC parameters that replicate transmission line parameters and RLC parameters of circuit elements in the signal path between the main driver and the counterpart transceiver IC.

Enhanced echo cancellation in full-duplex communication

Growing community of inventors

Shanghai, China

Qiming Wu