Memories for receiving or transmitting voltage signals might include an input or output buffer including a first stage having first and second inputs and configured to generate a current sink and source at its first and second outputs responsive to a voltage difference between its first and second inputs, and a second stage having a first input connected to the first output of the first stage, a second input connected to the second output of the first stage, a first voltage signal node connected to its first input through a first resistance, and a second voltage signal node connected to its second input through a second resistance, wherein a first inverter is connected in parallel with the first resistance, a second inverter is connected in parallel with the second resistance, and a pair of cross-coupled inverters are connected between the first voltage signal node and the second voltage signal node.

An amplifier circuit includes a differential input terminal, a first power supplier, an amplifier, and a current redistributor. A differential input terminal includes a first differential pair of a p-type and a second differential pair of an n-type, and receives an input voltage. A first power supplier supplies a bias current to the differential input terminal. An amplifier receives an output current of the first differential pair and an output current of the second differential pair, and applies an amplified current to an output node. A current redistributor receives the output current of the first differential pair and the output current of the second differential pair, and provides a redistribution current to the differential input terminal.

An amplifier circuit includes a differential input terminal, a first power supplier, an amplifier, and a current redistributor. A differential input terminal includes a first differential pair of a p-type and a second differential pair of an n-type, and receives an input voltage. A first power supplier supplies a bias current to the differential input terminal. An amplifier receives an output current of the first differential pair and an output current of the second differential pair, and applies an amplified current to an output node. A current redistributor receives the output current of the first differential pair and the output current of the second differential pair, and provides a redistribution current to the differential input terminal.

The present disclosure relates to a configurable output stage for a DAC channel. The output stage receives an analog output from a DAC and outputs a signal to an output terminal. The output stage is configurable between a voltage mode and a current mode. In the voltage mode, the output stage supplies the analog signal to the output terminal as a voltage signal. In the current mode, the output stage supplies the analog signal to the output signal as a current signal. The output stage can receive user input to select the desired mode. Consequently, an integrated circuit can be implemented with multiple DAC channels, each having the configurable output stage. A user can choose how many channels they want to operate in a voltage output mode, and how many channels they want to operate in a current output mode, depending on their individual requirements.

A power amplifier and power amplification circuit are described herein. An illustrative power amplifier is disclosed to include an input terminal, a drive amplifier connected to the input terminal, and an impedance modulator having a capacitance that is adjusted inversely and proportionately relative to a signal output by the drive amplifier, wherein the impedance modulator provides a feedback loop between an output of the drive amplifier and the input terminal.

A power amplifier and power amplification circuit are described herein. An illustrative power amplifier is disclosed to include an input terminal, a drive amplifier connected to the input terminal, and an impedance modulator having a capacitance that is adjusted inversely and proportionately relative to a signal output by the drive amplifier, wherein the impedance modulator provides a feedback loop between an output of the drive amplifier and the input terminal.

Memories for receiving or transmitting voltage signals might include an input or output buffer including a first stage having first and second inputs and configured to generate a current sink and source at its first and second outputs responsive to a voltage difference between its first and second inputs, and a second stage having a first input connected to the first output of the first stage, a second input connected to the second output of the first stage, a first voltage signal node connected to its first input through a first resistance, and a second voltage signal node connected to its second input through a second resistance, wherein a first inverter is connected in parallel with the first resistance, a second inverter is connected in parallel with the second resistance, and a pair of cross-coupled inverters are connected between the first voltage signal node and the second voltage signal node.

Apparatus useful for receiving or transmitting voltage signals might include a current generator having first and second inputs and configured to generate a current flow between first and second outputs responsive to a voltage difference between its first and second inputs. The apparatus might further include a feedback amplifier having a first input connected to the first output of the current generator, a second input connected to the second output of the current generator, a first voltage signal node connected to its first input through a first resistance, and a second voltage signal node connected to its second input through a second resistance, wherein a first inverter is connected in parallel with the first resistance, a second inverter is connected in parallel with the second resistance, and a pair of cross-coupled inverters are connected between the first voltage signal node and the second voltage signal node.

Apparatus useful for receiving or transmitting voltage signals might include a current generator having first and second inputs and configured to generate a current flow between first and second outputs responsive to a voltage difference between its first and second inputs. The apparatus might further include a feedback amplifier having a first input connected to the first output of the current generator, a second input connected to the second output of the current generator, a first voltage signal node connected to its first input through a first resistance, and a second voltage signal node connected to its second input through a second resistance, wherein a first inverter is connected in parallel with the first resistance, a second inverter is connected in parallel with the second resistance, and a pair of cross-coupled inverters are connected between the first voltage signal node and the second voltage signal node.

A test device is provided. An output terminal of an operational amplifier is coupled to a device under test. A current replication circuit copies a current flowing through a charging circuit and a discharge circuit according to voltages of control terminals of the charging circuit and the discharge circuit in the operational amplifier and outputs a test result signal.