An image sensor may include an array of image sensor pixels. The array of image sensor pixels may be controlled by row driver circuitry. The row driver circuitry may include row drivers that receive power supply signals from transconductance amplifier circuitry. The transconductance amplifier circuitry may include multiple amplifiers with output ports shorted to one another. Each amplifier may include input transistors, cross-coupled transistors with a low threshold voltage, and additional transistors coupled in series with the cross-coupled transistors and having a moderate or high threshold voltage.

Various embodiments of the present technology may comprise methods and apparatus for an amplifier circuit. Methods and apparatus for an amplifier circuit according to various aspects of the present invention may provide a first cross-connect circuit responsive to a first clock signal having a first phase and the third clock signal having a third phase. The amplifier circuit may provide a second cross-connect circuit responsive to a second clock signal having a second phase and a fourth clock signal having a fourth phase. The clock signals have a same frequency with offset phases.

Various embodiments of the present technology may comprise methods and apparatus for an amplifier circuit. Methods and apparatus for an amplifier circuit according to various aspects of the present invention may comprise a first cross-connect circuit configured to receive an input signal at an input terminal and transmit the input signal to an input stage circuit. The amplifier circuit may further comprise a second cross-connect circuit connected between the input stage circuit and an output stage circuit, and a voltage adjustment circuit connected to the input stage circuit. Each cross-connect circuit may comprise a plurality of switches.

Various embodiments of the present technology may comprise methods and apparatus for an amplifier circuit. Methods and apparatus for an amplifier circuit according to various aspects of the present invention may comprise a first cross-connect circuit configured to receive an input signal at an input terminal and transmit the input signal to an input stage circuit. The amplifier circuit may further comprise a second cross-connect circuit connected between the input stage circuit and an output stage circuit, and a voltage adjustment circuit connected to the input stage circuit. Each cross-connect circuit may comprise a plurality of switches.

An input/output circuit may include an input circuit, an amplifier circuit and a precharging circuit. The input circuit may load differential input data to setup nodes based on a data strobe clock. The amplifier circuit may compare and amplify the data that is loaded to the setup nodes and configured to output the amplified data. The precharging circuit may precharge the setup nodes based on the data strobe clock and the differential input data.

An apparatus includes a first common-source amplifier having a first PMOS (p-channel metal oxide semiconductor) transistor configured to receive a first voltage and output a first current; a second common-source amplifier having a first NMOS (n-channel metal oxide semiconductor) transistor configured to receive a second voltage and output a second current, wherein the first common-source amplifier and the second common-source amplifier share a common source node, and an AC (alternating current) component of the first voltage is an inversion of an AC component of the second voltage; a first common-gate amplifier having a second PMOS transistor configured to receive the first current and output a third current; a second common-gate amplifier having a second NMOS transistor configured to receive the second current and output a fourth current; and a load configured to terminate the third current and the fourth current.

An amplifier includes an input circuit that amplifies a difference between a first input voltage and a second input voltage to generate a first current and a second current. A positive feedback circuit amplifies a difference between the first current and the second current to generate a third current and a fourth current and outputs a difference between the third current and the fourth current through an output node. A temperature compensation circuit adjusts an amplification factor of the positive feedback circuit in response to a change of temperature.

A two-stage circuit includes a differential-to-single-ended first stage with a differential pair of transistors. The first stage includes a current mirror including a diode-connected transistor having an RC circuit coupled to a drain of the diode-connected transistor. The current mirror is configured to mirror a power supply noise current conducted by the RC circuit through a first stage output terminal to a gate of an output transistor in a second stage of the two-stage circuit.

A radio frequency receiver having a plurality of parallel receiving paths, wherein each path can receive a radio frequency signal in one of a plurality of radio frequency bands and amplify the received signal in a low noise amplifier. The amplified signals from the plurality of parallel paths are combined to one combined radio frequency signal in a common summation node and down-converted to a lower frequency signal in a mixer circuit. Each low noise amplifier comprises a low noise transconductance circuit providing a current signal to drive the common summation node, and an automatic gain control circuit in each path compensates for variations in signal strength independently of signal strengths of signals received by the other receiving paths. The receiver is suitable for simultaneous multiple band reception, where received signal strength can vary between the frequency bands.

A radio frequency receiver having a plurality of parallel receiving paths, wherein each path can receive a radio frequency signal in one of a plurality of radio frequency bands and amplify the received signal in a low noise amplifier. The amplified signals from the plurality of parallel paths are combined to one combined radio frequency signal in a common summation node and down-converted to a lower frequency signal in a mixer circuit. Each low noise amplifier comprises a low noise transconductance circuit providing a current signal to drive the common summation node, and an automatic gain control circuit in each path compensates for variations in signal strength independently of signal strengths of signals received by the other receiving paths. The receiver is suitable for simultaneous multiple band reception, where received signal strength can vary between the frequency bands.