A multi-stage switched capacitor circuit and an operation method thereof are provided. The multi-stage switched capacitor circuit includes a first operational stage, a second operational stage and a third operational stage that are serially connected in order. Each operational stage operates in a sample phase or a hold phase and generates a detection signal indicating an end of the hold phase. The operation method of the multi-stage switched capacitor circuit includes: controlling the second operational stage to operate in the hold phase when the detection signal of the first operational stage indicates the end of the hold phase of the first operational stage, and the detection signal of the third operational stage indicates the end of the hold phase of the third operational stage.

A transceiver device includes a digital baseband circuit, a first circuit portion, and a second circuit portion. The digital baseband circuit is configured to analyze power of an input signal, in order to generate a first control signal and a second control signal. The first circuit portion has a first gain, and is configured to be selected according to the first control signal to process the input signal to generate output signals. The second circuit portion has a second gain higher than the first gain, and is configured to be selected according to the second control signal to process the input signal to generate the output signals. The first circuit portion includes an N-way filter circuit, and the N-way filter circuit is configured to modulate the input signal according to first oscillating signals to perform a filtering operation.

A variable capacitor bank includes a conductive housing and a port extending through the housing. An electrical bus is disposed within the conductive housing and coupled to the port. The variable capacitor bank further includes capacitor modules disposed within the housing. Each capacitor module includes a module input electrically coupled to the electrical bus and a switched capacitor branch electrically coupled to the module input, the switched capacitor branch including a capacitor and a switch element in series with the capacitor. In certain implementations, one or more of the capacitor modules may include at least one second switched capacitor branch. The capacitor modules may further include an unswitched, or “floor”, capacitor that provides a minimum or otherwise known capacitance of the capacitor module. Each capacitor module may further be grounded by being electrically coupled to the conductive housing.

An active discharge system for electric or hybrid motor vehicles including an active discharge circuit operatively connected in parallel to a charge circuit, which is supplied by a high voltage power source and defines an electrically-charged equivalent capacitance of an electric charge, wherein the active discharge circuit is configured to discharge the electric charge accumulated by the equivalent capacitance in the event of the high voltage power source being disconnected from the charge circuit; a control circuit/device/unit/component of the active discharge circuit which are configured to receive an activation signal, suitable to activating the active discharge circuit in case of receiving the activation signal, so as to discharge the equivalent capacitance.

An apparatus comprises: a first circuitry to charge first and second capacitors to a predetermined voltage level; a second circuitry to discharge the first capacitor through a diode at a first time; a third circuitry to discharge the second capacitor through the diode at a second time, wherein the second time is greater than the first time; a comparator to compare a first voltage of the first capacitor with a second voltage of the second capacitor; and logic to adjust a scaling factor applied to the second voltage according to an output of the comparator.

A tunable filter is described where the frequency response as well as bandwidth and transmission loss characteristics can be dynamically altered, providing improved performance for transceiver front-end tuning applications. The rate of roll-off of the frequency response can be adjusted to improve performance when used in duplexer applications. The tunable filter topology is applicable for both transmit and receive circuits. A method is described where the filter characteristics are adjusted to account for and compensate for the frequency response of the antenna used in a communication system.

A fluctuation suppression circuit suppresses fluctuation of a reference voltage supplied to a switched capacitor circuit having a differential configuration. The switched capacitor circuit includes an input capacitor for charging an input voltage and a reference capacitor for charging the reference voltage. The input capacitor and the reference capacitor are separately disposed. The fluctuation suppression circuit includes an electric charge supply circuit. The electric charge supply circuit generates an offset electric charge by adopting a predetermined offset voltage, for offsetting a charged or discharged electric charge generated in the switched capacitor circuit, and supplies the offset electric charge to two reference input nodes, which are supplied with the reference voltage, in the switched capacitor circuit.

A PFM control circuit includes a switching circuit, a slope-decision circuit, a flip-flop, a first and a second comparison circuits. The first comparison circuit outputs a first signal according to an output voltage of a power conversion circuit. The switching circuit outputs a switching signal according to an output current of the power conversion circuit. The slope-decision circuit outputs a slope modulation voltage, and determines a slope modulation voltage with a first or a second slope according to the switching signal. The second comparison circuit outputs the second signal according to the slope modulation voltage. The flip-flop outputs a control signal to the power conversion circuit according to the first and the second signals. When the slope modulation voltage has the first or the second slope, the control signal has a first or a second frequency accordingly. The first frequency is higher than the second frequency.

Magnetic field sensors and associated techniques use a Hall effect element in a current spinning arrangement in combination with a rippled reduction feedback network configured to reduce undesirable spectral components generated by the current spinning and other circuit elements.

Phase-locked loop circuitry to generate an output signal, the phase-locked loop circuitry comprising oscillator circuitry, switched resistor loop filter, coupled to the input of the oscillator circuitry (which, in one embodiment, includes a voltage-controlled oscillator), including a switched resistor network including at least one resistor and at least one capacitor, wherein an effective resistance of the switched resistor network is responsive to and increases as a function of one or more pulsing properties of a control signal (wherein pulse width and frequency (or period) are pulsing properties of the control signal), phase detector circuitry, having an output which is coupled to the switched resistor loop filter, to generate the control signal (which may be periodic or non-periodic). The phase-locked loop circuitry may also include frequency detection circuitry to provide a lock condition of the phase-locked loop circuitry.