A clock signal generation circuit for a switched capacitor circuit with a chopping function unit includes: first and second synchronous clock circuits that generate first and second synchronous clock signals, respectively; an edge signal generation circuit that generates one or more rise and fall edge signals by delaying the first synchronous clock signal; a first clock generator that generate a first clock signal group for driving the switched capacitor circuit; and a second clock generator that generates a second clock signal group for driving the chopping function unit. Frequencies of the first and second clock signal groups are respectively defined by the first and second synchronous clock circuits. Rise and fall edges of the first and second clock signal groups are defined by the edge signal generation circuit.

A clock signal generation circuit for a switched capacitor circuit with a chopping function unit includes: first and second synchronous clock circuits that generate first and second synchronous clock signals, respectively; an edge signal generation circuit that generates one or more rise and fall edge signals by delaying the first synchronous clock signal; a first clock generator that generate a first clock signal group for driving the switched capacitor circuit; and a second clock generator that generates a second clock signal group for driving the chopping function unit. Frequencies of the first and second clock signal groups are respectively defined by the first and second synchronous clock circuits. Rise and fall edges of the first and second clock signal groups are defined by the edge signal generation circuit.

A system includes a mixer of a phase interpolator. The mixer includes a dynamic load whose output signal is coupled to a subsequent stage of the phase interpolator. The dynamic load is configured to provide an alternating current (AC) signal to the subsequent stage of the phase interpolator as input clock signals. The mixer further includes a static load whose output signal is coupled to the subsequent stage of the phase interpolator in parallel with the respective output signal line of the dynamic load. The static load configured to provide a direct current (DC) signal to the phase interpolator temporarily in replacement of the respective AC signals to prevent output signals of the subsequent stage of the phase interpolator from being unpredictable.

A system includes a mixer of a phase interpolator. The mixer includes a dynamic load whose output signal is coupled to a subsequent stage of the phase interpolator. The dynamic load is configured to provide an alternating current (AC) signal to the subsequent stage of the phase interpolator as input clock signals. The mixer further includes a static load whose output signal is coupled to the subsequent stage of the phase interpolator in parallel with the respective output signal line of the dynamic load. The static load configured to provide a direct current (DC) signal to the phase interpolator temporarily in replacement of the respective AC signals to prevent output signals of the subsequent stage of the phase interpolator from being unpredictable.

Systems, methods, and apparatus for use in biasing and driving high voltage semiconductor devices using only low voltage transistors are described. The apparatus and method are adapted to control multiple high voltage semiconductor devices to enable high voltage power control, such as power amplifiers, power management and conversion (e.g. DC/DC) and other applications wherein a first voltage is large compared to the maximum voltage handling of the low voltage control transistors. According to an aspect, timing control of edges of a control signal to the high voltage semiconductor devices is provided by a basic edge delay circuit that includes a transistor, a current source and a capacitor. An inverter can be selectively coupled, via a switch, to an input and/or an output of the basic edge delay circuit to allow for timing control of a rising edge or a falling edge of the control signal.

Systems, methods, and apparatus for use in biasing and driving high voltage semiconductor devices using only low voltage transistors are described. The apparatus and method are adapted to control multiple high voltage semiconductor devices to enable high voltage power control, such as power amplifiers, power management and conversion (e.g. DC/DC) and other applications wherein a first voltage is large compared to the maximum voltage handling of the low voltage control transistors. According to an aspect, timing control of edges of a control signal to the high voltage semiconductor devices is provided by a basic edge delay circuit that includes a transistor, a current source and a capacitor. An inverter can be selectively coupled, via a switch, to an input and/or an output of the basic edge delay circuit to allow for timing control of a rising edge or a falling edge of the control signal.

Bias adjusting circuits (1_(2k-1), 1_2k) (where k is an integer equal to or greater than 1 and equal to or less than N, and N is an integer equal to or more than .sub.2) adjust DC bias voltage of at least one of clock signals such that a duty ratio, which is a ratio between a period in which a clock signal is High as to a clock signal and a period in which the clock signal is Low thereasto, becomes (2N-2k+1):(2k-1). Sampling circuits switch between a track mode in which an output signal tracks an input signal, and a hold mode in which a value of the input signal at a timing of switching from the track mode to the hold mode is held and output, in accordance with clock signals output from the bias adjusting circuits (2_1 to 2_2N).

Bias adjusting circuits (1_(2k-1), 1_2k) (where k is an integer equal to or greater than 1 and equal to or less than N, and N is an integer equal to or more than .sub.2) adjust DC bias voltage of at least one of clock signals such that a duty ratio, which is a ratio between a period in which a clock signal is High as to a clock signal and a period in which the clock signal is Low thereasto, becomes (2N-2k+1):(2k-1). Sampling circuits switch between a track mode in which an output signal tracks an input signal, and a hold mode in which a value of the input signal at a timing of switching from the track mode to the hold mode is held and output, in accordance with clock signals output from the bias adjusting circuits (2_1 to 2_2N).

A system includes a mixer of a phase interpolator. The mixer includes a dynamic load whose output signal is coupled to a subsequent stage of the phase interpolator. The dynamic load is configured to provide an alternating current (AC) signal to the subsequent stage of the phase interpolator as input clock signals. The mixer further includes a static load whose output signal is coupled to the subsequent stage of the phase interpolator in parallel with the respective output signal line of the dynamic load. The static load configured to provide a direct current (DC) signal to the phase interpolator temporarily in replacement of the respective AC signals to prevent output signals of the subsequent stage of the phase interpolator from being unpredictable.

A system includes a mixer of a phase interpolator. The mixer includes a dynamic load whose output signal is coupled to a subsequent stage of the phase interpolator. The dynamic load is configured to provide an alternating current (AC) signal to the subsequent stage of the phase interpolator as input clock signals. The mixer further includes a static load whose output signal is coupled to the subsequent stage of the phase interpolator in parallel with the respective output signal line of the dynamic load. The static load configured to provide a direct current (DC) signal to the phase interpolator temporarily in replacement of the respective AC signals to prevent output signals of the subsequent stage of the phase interpolator from being unpredictable.