A receiver front end capable of receiving and processing intraband non-contiguous carrier aggregate (CA) signals using multiple low noise amplifiers (LNAs) is disclosed herein. A cascode having a common source input stage and a common gate output stage can be turned on or off using the gate of the output stage. A first switch is provided that allows a connection to be either established or broken between the source terminal of the input stage of each cascode. Further switches used for switching degeneration inductors, gate/sources caps and gate to ground caps for each legs can be used to further improve the matching performance of the invention.

A receiver front end capable of receiving and processing intraband non-contiguous carrier aggregate (CA) signals using multiple low noise amplifiers (LNAs) is disclosed herein. A cascode having a common source input stage and a common gate output stage can be turned on or off using the gate of the output stage. A first switch is provided that allows a connection to be either established or broken between the source terminal of the input stage of each cascode. Further switches used for switching degeneration inductors, gate/sources caps and gate to ground caps for each legs can be used to further improve the matching performance of the invention.

In a semiconductor device, a first variable gain amplifier and a second variable gain amplifier constitute a switched capacitor type variable gain amplifier. A selection switch switches connection among the first variable gain amplifier, the second variable gain amplifier, and a load circuit such that the first variable gain amplifier and the load circuit are connected to each other when an amplification factor of the first variable gain amplifier is a predetermined gain or less, and the second variable gain amplifier is connected between the first variable gain amplifier and the load circuit when the amplification factor of the first variable gain amplifier is larger than the predetermined gain.

A booster control device includes an output voltage detection unit that detects output voltage of a booster which changes the output voltage according to a phase difference; a storage battery voltage detection unit that detects storage battery voltage; and a booster control unit that performs feedback control on the output voltage of the booster in order for a difference between an output voltage command value to the booster and detected output voltage to be equal to zero. Further, the booster control unit includes a gain control unit that corrects a control gain according to the storage battery voltage on the basis of storage battery voltage dependency of an input-output characteristic representing booster output with respect to a phase difference of the booster, in order for the booster output to have the control gain uniquely determined by the phase difference and outputs a control phase difference to the booster.

A programmable amplifier includes an amplifier, an input capacitor, a feedback circuit, and a high-pass filter circuit. The amplifier has an input coupled to the input capacitor for receiving an input signal. The feedback circuit includes multiple feedback capacitors of differing capacitance values that are each selectively coupled between the output of the amplifier and the input of the amplifier using multiple first switches. The high-pass filter circuit includes multiple switched capacitors of differing capacitance values that are each selectively coupled between the amplifier output and a ground node using multiple second switches. The first switches are configured to be selectively switched on for activating at least one feedback capacitor to adjust a gain of the amplifier, while the second switches are configured to be selectively switched at a first and second phase of a clock signal to adjust a high-pass cutoff frequency of the amplifier independently of how the gain is adjusted.

A physical quantity detection device includes a switched capacitor filter circuit having a first sample-and-hold circuit adapted to sample and hold a first signal, which is based on an output signal of a physical quantity detection element, an amplifier circuit to which an output signal of the first sample-and-hold circuit is input, and a first switched capacitor circuit to which a first output signal of the amplifier circuit is input, wherein an output signal of the first switched capacitor circuit is input to the amplifier circuit, and an A/D conversion circuit adapted to perform an A/D conversion on an output signal of the switched capacitor filter circuit.

An amplifier circuit that includes a capacitor voltage divider that is selectively enabled with a switch. The circuit includes two capacitor banks where the banks are electrically coupled to opposing side terminals of the switch. When the capacitor voltage divider is not enabled, one bank is adjusted to control the gain of the amplifier. When the capacitor voltage divider is enabled, both banks are used to control the gain of the amplifier.

A programmable-gain amplifier includes: two complementary cross-coupled transistor pairs mutually coupled with each transistor in one pair having a current flow path cascaded with a current flow path of a respective one of the transistors in the other pair. First and second coupling points are formed between the pairs; with first and second sampling capacitors coupled thereto. First and second input stages have input terminals to input signals for sampling by the first and second sampling capacitors. Switching means couple the first and second input stages to the sampling capacitors so the input signals are sampled as sampled signals on the sampling capacitors. The switching means energizes the complementary cross-coupled transistor pairs so the signals sampled on the sampling capacitors undergo negative resistance regeneration growing exponentially over time to thereby provide an exponential amplifier gain.

A method and electronic circuit for changing the gain of a radio frequency signal. The apparatus is an electronic circuit comprising one or more variable gain electronic elements, and one or more adjustable phase shifting elements. The method comprises the steps of receiving a radio frequency signal, varying the gain of the variable gain electronic element while the variable gain electronic element changes the amplitude of the radio frequency signal, and adjusting an adjustable phase shifting element to generate a reverse phase shift in the radio frequency signal in response to the associated phase shift from the step of varying the gain.

Systems and methods disclosed herein provide for enhancing the low frequency (DC) gain of an operational amplifier with multiple correlated level shifting capacitors. In an embodiment, the operational amplifier is level shifted with a first correlated level shifting capacitor in a first phase and, then, is level shifted again with at least a second correlated level shifting capacitor in at least a second, non-overlapping, consecutive phase. In an embodiment, the multiple correlated level capacitors are controlled by a switching circuit network.