An integrated circuit device includes a variable gain amplifier with multiple gain circuits coupled in parallel, where one or more of the multiple gain circuits comprises a first differential pair of transistors, and a complementarily switched second differential pair of transistors cross-connected to the first differential pair of transistors with a sign inversion relative to the first differential pair of transistors. Other examples are disclosed and claimed.

A current measurement circuit includes an operational amplifier, an input connector, a gain control sub-circuit, and a measurement output. The operational amplifier includes two inputs and an output. The input connector is for connecting the two inputs across a current-sense resistor. The gain control sub-circuit is connected to the output and includes a switch operable to select a current path from a plurality of current paths. The measurement output is connected to the gain control sub-circuit for outputting a signal indicating a measured current based on a selected current path. The gain control sub-circuit is configured to select a gain across the operational amplifier based on a ratio between the input connector and the selected current path.

An electronic circuit includes: a variable amplitude control circuit that controls an amplitude of a first radio-frequency signal being a single-ended signal in accordance with a control signal that continuously changes and that outputs a second radio-frequency signal being a single-ended signal; and a balun that converts the second radio-frequency signal into differential signals and outputs a pair of third radio-frequency signals.

A capacitor-less linear Low Drop Out (LDO) Voltage Regulating (VR) system and method with enhanced Power Supply Rejection (PSR), line transient response, and load transient response is disclosed. The system includes a current-summing amplifier to refine input voltage and error signals from an error amplifier circuit, improving regulation accuracy. Further, the system includes a Dynamic Current Bleeder (DCB) circuit to manage current flow, optimizing efficiency. Furthermore, a strategically placed compensation capacitor ensures stable voltage delivery despite load or input changes. To further enhance performance, a boost and reduce amplifier circuit continuously monitors and adjusts current of the error amplifier circuit, minimizing output voltage variations. The system effectively manages applications demanding highly regulated and stable voltage supplies.

Variable gain amplifiers (VGAs) with fine attenuation step control and flat signal-to-noise ratio (SNR) versus attenuation are provided. In certain embodiments, a VGA includes an input that receives a radio frequency (RF) input signal, a segmented amplification circuit including multiple amplification cells that operate in parallel to amplify the RF input signal to generate multiple amplified RF signals, an impedance ladder including multiple taps each connected to a different node of the impedance ladder, and switches that control routing of the amplified RF signals to one or more selected taps of the impedance ladder. Accordingly, the VGA uses the switches to connect the outputs of the segmented amplification circuit to the selected tap(s) of the impedance ladder. By changing the tap selection, the attenuation step of the VGA is controlled.

Provided in the present disclosure is a variable gain amplifier, including: a voltage signal input end; a high level generation module including two high level signal output ends, and configured to convert a voltage signal input from the voltage signal input end into a first high level signal and a second high level signal; a switch signal conversion module including a high level signal input end, N digital signal input ends and N switch signal output ends, and configured to output, through corresponding switch signal output ends and under the control of signals input from the digital signal input ends, gain control signals associated with a signal output from the first high level signal output end; and an amplification module including an amplification unit and N stages of gain control units, where N is a positive integer not less than 1. Further provided is a transmitting apparatus.

Disclosed are systems and methods for a variable-gain differentiator in series with at least two non-inverting amplifiers. The variable-gain differentiator is connected to a voltage-controlled source at its non-inverting input and to its output at its inverting input. The output is connected to the non-inverting input of the first non-inverting amplifier. The output of the first non-inverting amplifier is connected to the input of the second non-inverting amplifier. The output of the second non-inverting amplifier is connected to a series of three integrators. Each integrator is connected to its output by a feedback path. Varying the gain of the voltage-controlled amplifier varies the gain of the differentiator at the output of the third integrator, thereby varying the output of the system.

A circuit includes an operational amplifier and a resistor network coupled to an output of the operational amplifier. The resistor network includes a first set of resistors coupled between the output of the operational amplifier and a first node of the resistor network, wherein the resistors of the first set are electrically connected in series with each other, a second set of resistors coupled between the first node and a second node of the resistor network, wherein the resistors of the second set are electrically connected in series with each other and include a first number of resistors, a third set of resistors coupled between the second node and a third node of the resistor network, wherein the third node is coupled to a first voltage, and wherein the resistors of the third set are electrically connected in parallel with each other and include a second number of resistors, and a resistor coupled between the first node and the second node and arranged in parallel with the second set of resistors.

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 includes generating a first gain control signal and a second gain control signal in response to a gain transition signal indicating a transition of a power converter from a first gain mode to a second gain mode. The method further includes causing the power converter to enter the first gain mode in response to the first gain control signal, and causing the power converter to enter the second gain mode in response to the second gain control signal. A circuit includes a gain transition controller generating a first gain control signal and a second gain control signal in response to a gain transition signal, and a gain control circuit causing the power converter to enter the first gain mode in response to the first gain control signal and causing the power converter to enter the second gain mode in response to the second gain control signal.