A low voltage drive circuit includes a transmit digital to analog circuit that converts transmit digital data into analog outbound data by: generating a DC component; generating a first oscillation at a first frequency; generating a second oscillation at the first frequency; and outputting the first oscillation or the second oscillation on a bit-by-bit basis in accordance with the transmit digital data to produce an oscillating component, wherein the DC component is combined with the oscillating component to produce the analog outbound data, and wherein the oscillating component and the DC component are combined to produce the analog outbound data. A drive sense circuit drives an analog transmit signal onto a bus, wherein the analog outbound data is represented within the analog transmit signal as variances in loading of the bus at the first frequency and wherein analog inbound data is represented within an analog receive signal as variances in loading of the bus at a second frequency.

A filter device configured to directly connect to a differential power amplifier of a transmit chain circuit. The filter device may include a transformer and a filter configured as a half lattice equivalent topology and having a single-ended output. The filter may be a lattice filter configured as a full lattice topology or a lattice equivalent filter configured as a half lattice equivalent topology. The filter includes a first branch having a first impedance network of one or more first impedance elements and a second branch having a second impedance network of one or more second impedance elements. The single-ended output of the filter device may connect to an antenna switch that is in turn connected to an antenna.

An apparatus for canceling an input offset of a receiver including a differential amplification unit and a differential comparison unit in a distance sensing system includes: an output monitoring unit selectively monitoring differential outputs of the differential comparison unit and the differential amplification unit; a current type digital-analog conversion unit connected to each of an input terminal of the differential comparison unit and the input terminal of the differential amplification unit; and a control unit controlling the current type digital-analog conversion unit to reduce a difference in differential output of the differential comparison unit according to a comparison result for the difference of the monitored differential output of the differential comparison unit and controlling the current type digital-analog conversion unit to reduce the difference in differential output of the differential amplification unit according to the comparison result for the difference of the monitored differential output of the differential amplification unit.

Provided is a reception circuit that suppresses skew of a waveform of a signal and enables high-speed data communication.

A reception circuit according to the present disclosure includes: a first differential stage that receives a first input signal and a second input signal at a first input unit and a second input unit, respectively, and causes first and second currents corresponding to the first and second input signals, respectively, to flow; a second differential stage including a first current path that generates and outputs a first amplified signal corresponding to the first current and a second current path that generates and outputs a second amplified signal corresponding to the second current; a power supply line that supplies power to the first and second differential stages; and at least one variable resistance unit provided in the first or second current path.

A sigma-delta ADC is described including a passive filter with an input coupled to the ADC input and a filter output. A gain stage has an input connected to the filter output. A quantiser has an input connected to the gain stage output and a quantiser output. The passive filter includes a first filter resistor between the filter input and the filter output and a filter capacitor having first terminal coupled to the filter output. A feedback resistor is coupled between the quantiser output and the filter output and receives a negative of the value of the output to provide negative feedback to the filter output. The gain stage has a capacitor and resistor in series, and a gain element connected to the gain stage input and an output connected to the gain stage output. One terminal of the gain stage capacitor is connected to the gain element output.

According to one embodiment of the present invention, provided is an analog to digital converter. The analog-to-digital converter according to one embodiment of the present invention comprises an analog amplification unit and a flash conversion unit, wherein the analog amplification unit may have a structure in which in which two input terminal circuits that alternately operate share a single amplifier. Accordingly, the analog-to-digital converter according to one embodiment of the present invention can be implemented in a smaller area and operate at low power, and can have a high resolution while operating at a high speed.

A charge-steering amplifier circuit and a control method thereof are provided. The charge-steering amplifier circuit is used for amplifying a differential input signal and includes a sample-and-hold circuit, a charge-steering amplifier, a reference voltage generation circuit, and a switch circuit. The sample-and-hold circuit is configured to sample the differential input signal to generate first and second sampled signals. The charge-steering amplifier has a first input terminal, a second input terminal, a first output terminal, and a second output terminal. The first and second input terminals receive the first and second sampled signals, respectively. The reference voltage generation circuit is configured to generate a reference voltage according to the differential input signal. The switch circuit is configured to couple the reference voltage to the first output terminal and the second output terminal.

An amplifier with temperature compensation where the amplifier has transistors configured to amplify a received signal to create an amplified signal. The amplifier gain changes over temperature. A gain control circuit, connected to the amplifier, that adjusts the amplifier gain responsive to a gain control signal. A temperature compensation circuit includes numerous elements. A constant current source that generates a constant current which is used to create a constant voltage. A temperature dependent current source that generates a temperature dependent current which is used to create a temperature dependent voltage, such that the temperature dependent current source has an inverse temperature dependance as compared to the amplifier. An operational amplifier compares the constant voltage to the temperature dependent voltage and generates an offset signal which varies over temperature. A gated buffer is configured to receive the offset signal and responsive thereto, selectively modify the gain control signal.

Enhanced operational amplifier trim circuitry and techniques are presented herein. In one implementation, a circuit includes a reference circuit configured to produce a set of reference voltages, and a digital-to-analog conversion (DAC) circuit. The DAC circuit comprises a plurality of transistor pairs, where each pair among the plurality of transistor pairs is configured to provide portions of adjustment currents for an operational amplifier based at least on the set of reference voltages and sizing among transistors of each pair. The circuit also includes drain switching elements coupled to drain terminals of the transistors of each pair and configured to selectively couple one or more of the portions of the adjustment currents to the operational amplifier in accordance with digital trim codes.

In a preamplifier (amplifier) for the radiation detector, an interconnection layer connected to the bonding pad forms one electrode of a feedback capacitor. Since there is no wiring for connecting the bonding pad and capacitor, a parasitic capacitance caused by the wiring will not be generated. Moreover, the capacitor is arranged below the bonding pad with a conductive layer serving as the other electrode, so that the feedback capacitance of the capacitor is included in the parasitic capacitance between the interconnection layer and the substrate. Compared to the conventional case, an amount of capacitance corresponding to the parasitic capacitance caused by wiring and the feedback capacitance for the capacitor is reduced from the input capacitance. Thus, the input capacitance for the amplifying circuit is reduced.