A switched capacitor low-pass filter. The filter includes a plurality of switched capacitors, and a plurality of resistors. The resistors increase the slope of the roll-off of the filter, reduce DC gain variations across corners, and minimize the frequency variation across corners. In some embodiments, the clock signal used to control the switched capacitor filters has a duty cycle differing from 50%, to improve the frequency response of the filter.

A composite electronic component includes: a power stabilization unit including a capacitor and an inductor connected to each other in series and configured to rectify input voltage to generate output voltage; and a switch unit including a first switch connected to the capacitor in parallel and a second switch connected to the inductor in parallel.

A system may comprise a high-pass filter having an input for receiving an input signal, an output for generating an output signal, a capacitor coupled between the input and the output, a switched-capacitor resistor coupled between the output and a reference voltage, and control circuitry configured to control the reference voltage to cancel current leakage into a circuit coupled to the output. The input, the output, the capacitor, and the switched-capacitor resistor may be arranged to generate the output signal as a high-pass filtered version of the input signal and the high-pass filter may be configured to operate in a plurality of modes comprising at least a high-impedance mode and a low-impedance mode in which the resistance of the switched-capacitor resistor is significantly smaller than the resistance when in the high-impedance mode. A system may include a plurality of processing paths having a first path configured to generate a first digital signal based on an analog input signal and a second path configured to generate a second digital signal based on the analog input signal, the second path having a high-pass filter for filtering the analog input signal prior to the analog input signal being processed by the remainder of the second path, and the high-pass filter having a corner frequency. Control circuitry may be configured to determine frequency-dependent weighted proportions of the first and second digital signals to be combined into an output digital signal based on a characteristic of the analog input signal. Frequency-dependent weighted proportions may be such that the digital output signal includes spectral content of the first digital signal below the corner frequency to account for spectral content of the second digital signal below the corner frequency being filtered. A system may include an input for receiving an input signal, an output for generating an output signal, a capacitor coupled between the input and the output, a variable resistor coupled to the output and having a plurality of modes including a first mode in which the variable resistor has a first resistance and a second mode in which the variable resistor has a second resistance, and control circuitry configured to determine a difference between the input signal and the output signal and switch between modes of the plurality of modes when the difference is less than a predetermined threshold.

A compact signal averaging circuit having an input, a first switch operatively connected to the input, a second switch operatively connected to the first switch, wherein the first switch is coupled to the circuit between the input and the second switch, a first FET having a gate, a source and a drain, wherein the gate is operatively connected to the circuit between the first switch and the second switch, a second FET comprising a gate, a source and a drain, wherein the source is operatively connected to a voltage supply and to the second switch, and an output operatively connected to the first FET drain and the second FET drain.

A first analog block includes a first plurality of switched capacitors and a second analog block includes a second plurality of switched capacitors. A switch associated with the first plurality of switched capacitors as well as a switch associated with the second plurality of switched capacitors may be configured based on one or more analog functions. The configuring of the first analog and the second analog block may include the configuring of the switch associated with the first plurality of switched capacitors when the analog function is associated with a first single ended signal and the configuring of both the switch associated with the first plurality of switched capacitors and the switch associated with the second plurality of switched capacitors when the analog function is associated with a differential signal.

Embodiments of the invention relate to a reference voltage pre-processing circuit and method for a reference voltage buffer. The embodiments include a filter to control/reduce the noise and/or interference attached to a reference voltage to be provided to a reference voltage buffer by passing the reference voltage via two transistor in series. Furthermore, the embodiments include an auxiliary voltage circuit which interfaces the filter and the reference voltage buffer to avoid that the reference voltage buffer get an invalid reference voltage.

The present disclosure relates to an input circuit comprising positive and negative branches, each branch comprising a transistor arranged for receiving an input voltage at its gate terminal and a first fixed voltage at its drain terminal via a first switch characterized in that the source terminal of the transistor in each of the positive branch and the negative branch is connectable via a second switch to a first plate of a first capacitor in the positive branch and of a second capacitor in the negative branch, respectively, with a second plate of the first capacitor and of the second capacitor being connected to a second fixed voltage and the input circuit further being arranged for receiving a first reset voltage on the first plate of the first capacitor in the positive branch and a second reset voltage on the first plate of the second capacitor in the negative branch.

A variable resistor may be coupled between a reference voltage source and components of an integrated circuit to reduce issues relating to thermal noise from a reference voltage signal generated by the reference voltage source. The variable resistor may be set to a low level during a first time period and a high level during a second time period, in which the time periods correspond to a sampling period of a switched-capacitor circuit. The low resistance time period may allow quick settling of an input reference voltage signal, whereas the high resistance time period may reduce a bandwidth of noise on a sampling capacitor coupled to the reference voltage signal. The variable resistor and switched-capacitor network may be used in an analog-to-digital converter (ADC), such as in audio circuits.

A microelectromechanical resonant circulator device is providing, having a substrate, and at least three electrical ports supported on the substrate. At least three electromechanical resonator elements are connected with associated switch elements and an associated port. The switch elements are operative to provide commutation over time of the electromechanical resonator elements.

Methods and apparatus include and amplifier circuit and a first capacitor branch including a first plurality of capacitors. The first capacitor branch couples to an input signal and to an input of the amplifier circuit. A second capacitor branch includes a second plurality of capacitors. The second capacitor branch couples to the input of the amplifier circuit and to an output of the amplifier circuit.