In an embodiment, A device includes an operational amplifier and a feedback loop. The feedback loop is coupled between a first input of the operational amplifier and an output of the operational amplifier. The feedback loop is controllable according to a saturation of the operational amplifier. In one example, the device is incorporated in a microcontroller.

This technology relates to a single-phase differential conversion circuit for improving the linearity of input/output characteristics, a signal processing method for use with the circuit, and a reception apparatus. The single-phase differential conversion circuit includes a first source-grounded amplifier and a second source-grounded amplifier. Each of the amplifiers includes a transconductance amplifier section including a transistor for converting an AC component of input potential to a current, a diode load section including a transistor in a diode connection configured as a first load, and a large-signal distortion compensation circuit configured as a second load connected in parallel with the first load. The transistors of the first source-grounded amplifier are each a P-type MOS transistor, and the transistors of the second source-grounded amplifier are each an N-type MOS transistor. This technology is applied advantageously to a reception apparatus for receiving TV signals, for example.

This technology relates to a single-phase differential conversion circuit for improving the linearity of input/output characteristics, a signal processing method for use with the circuit, and a reception apparatus. The single-phase differential conversion circuit includes a first source-grounded amplifier and a second source-grounded amplifier. Each of the amplifiers includes a transconductance amplifier section including a transistor for converting an AC component of input potential to a current, a diode load section including a transistor in a diode connection configured as a first load, and a large-signal distortion compensation circuit configured as a second load connected in parallel with the first load. The transistors of the first source-grounded amplifier are each a P-type MOS transistor, and the transistors of the second source-grounded amplifier are each an N-type MOS transistor. This technology is applied advantageously to a reception apparatus for receiving TV signals, for example.

The present disclosure describes exemplary line drivers for use in an exemplary wireline transmission device. In some situations, the exemplary line drivers are electrically connected to a wireline communication channel to transmit information. The exemplary line drivers prevent charge sharing with the wireline communication channel. The exemplary line drivers disclosed herein charge various circuit nodes to various logical values, such as a logical zero or a logical one, to prevent charge sharing with the wireline communication channel.

An output driver with programmable single-ended and differential outputs includes a first switch, a first output attenuator, and a programmable attenuator. The first switch is coupled in a shunt configuration to a first path of a differential output of a first amplifier. The first output attenuator is included in the first path and is coupled to the first switch in accordance with the shunt configuration. The programmable attenuator is included in a second path of the differential output of the first amplifier.

An output driver with programmable single-ended and differential outputs includes a first switch, a first output attenuator, and a programmable attenuator. The first switch is coupled in a shunt configuration to a first path of a differential output of a first amplifier. The first output attenuator is included in the first path and is coupled to the first switch in accordance with the shunt configuration. The programmable attenuator is included in a second path of the differential output of the first amplifier.

A current feed-back instrumentation amplifier (CFIA) comprises a differential pair with degeneration for amplifying small differential voltages in the presence of large common-mode voltages. The CFIA includes input and feedback transconductors and a trimming circuit that trims the back-bias voltages of the transistors in each transconductor. The trimming circuit includes a plurality of selectable resistors disposed in the signal path of the tail current in each transconductor. Each of the plurality of selectable resistors has a switch coupled to it. When a switch is closed, only the resistors up to the respective switch are in the signal path of the bulk-to-source voltage of the differentially paired transistors. The resistor trimming circuit reduces the mismatch between transconductances of the respective differential pair transistors, in turn reducing mismatch of the overall transconductances of the transconductors, and thereby reducing the CFIA's gain error.

A current feed-back instrumentation amplifier (CFIA) comprises a differential pair with degeneration for amplifying small differential voltages in the presence of large common-mode voltages. The CFIA includes input and feedback transconductors and a trimming circuit that trims the back-bias voltages of the transistors in each transconductor. The trimming circuit includes a plurality of selectable resistors disposed in the signal path of the tail current in each transconductor. Each of the plurality of selectable resistors has a switch coupled to it. When a switch is closed, only the resistors up to the respective switch are in the signal path of the bulk-to-source voltage of the differentially paired transistors. The resistor trimming circuit reduces the mismatch between transconductances of the respective differential pair transistors, in turn reducing mismatch of the overall transconductances of the transconductors, and thereby reducing the CFIA's gain error.

A radio-frequency signal amplifier circuit that is used in a front-end circuit and that propagates a radio-frequency transmission signal and a radio-frequency reception signal is described. The amplifier circuit has an amplifier transistor, a bias circuit, a resistor, and an LC series resonance circuit. The LC series resonant circuit has one end that is connected to a node between the resistor and a signal input terminal, and has another end that is connected to a grounding terminal. A resonant frequency of the LC series resonance circuit is included in a difference frequency band between the frequencies of the transmission signal and the reception signal.

A radio-frequency signal amplifier circuit that is used in a front-end circuit and that propagates a radio-frequency transmission signal and a radio-frequency reception signal is described. The amplifier circuit has an amplifier transistor, a bias circuit, a resistor, and an LC series resonance circuit. The LC series resonant circuit has one end that is connected to a node between the resistor and a signal input terminal, and has another end that is connected to a grounding terminal. A resonant frequency of the LC series resonance circuit is included in a difference frequency band between the frequencies of the transmission signal and the reception signal.