Embodiments relate to a circuit implementation for extending the bandwidth of an amplifier. The extended bandwidth amplifier includes an amplifier coupled between an input node and an output node of the extended bandwidth amplifier. The amplifier has an input capacitance and an output capacitance. The extended bandwidth amplifier additionally includes a first digitally-trimmable negative-capacitance capacitor coupled between the input node of the extended bandwidth amplifier and a power supply terminal. The digitally-trimmable negative-capacitance capacitor includes a first branch, a second branch, and a controller. The first branch includes a first capacitor having a first negative capacitance, and a first switch. The second branch includes a second capacitor having a second negative capacitance, and a second switch. The controller is configured to turn on the first switch and the second switch based on the input capacitance of the amplifier.

An amplifier has a first amplifying circuit configured to receive a voltage input and to output an amplified current, a second amplifying circuit configured to receive the amplified current and to output an amplified voltage, the second amplifying circuit comprising a pair of feedback resistive elements, each feedback resistive element being coupled to a gate and drain of a corresponding transistor in a pair of output transistors in the second amplifying circuit, and a feedback circuit configured to provide a negative feedback loop between an input and an output of the pair of output transistors, the feedback circuit including a first transconductance amplification circuit and a first equalizing circuit.

An ion detection current conversion circuit includes a conversion amplifier coupled with a conversion resistor assembly for converting an ion detection current produced by an ion detector into an ion detection voltage, the conversion resistor assembly comprising a resistor having a high resistance and a capacitive compensation element, and a compensation voltage circuit for deriving a compensation voltage from the ion detection voltage and feeding the compensation voltage to the capacitive compensation element, the compensation voltage circuit comprising a variable resistor for adjusting the compensation voltage.

Disclosed in the present invention are a radio frequency power amplifier based on power detection feedback, a chip, and a communication terminal. The radio frequency power amplifier comprises multiple stages of amplifier circuits and at least one power detection feedback circuit; the input end of the power detection feedback circuit is connected to the output end of a current stage of amplifier circuit, and the output end of the power detection feedback circuit is connected to the input ends of the current stage of amplifier circuit and at least one stage of amplifier circuit located prior to the current stage of amplifier circuit. The power detection feedback circuit generates, according to the detected output power of the current stage of amplifier circuit, a control voltage varying inversely with the output power, so that the power detection feedback circuit outputs current varying positively with the control voltage.

A signal amplifying circuit device comprises a mixer and a first and second amplifiers connected in series, where the mixer is configured to receive an RF signal and two LO signals with a preset phase difference therebetween and output a first and a second mixed signals, the first amplifier includes a first input terminal for receiving the first mixed signal, a second input terminal for receiving the second mixed signal, and a first and second output terminals, the second amplifier includes a first input terminal connected to the first output terminal of the first stage of amplifier at a first joint, a second input terminal connected to the second output terminal of the first stage of amplifier at a second joint, a first output terminal, and a second output terminal. A receiver including the signal amplifying circuit device is also disclosed.

Disclosed in the present invention are a radio frequency power amplifier based on current detection feedback and a chip. The radio frequency power amplifier comprises multiple stages of amplifier circuits and at least one current detection feedback circuit; the input end of the current detection feedback circuit is connected to the input end of a current stage of amplifier circuit among the multiple stages of amplifier circuits by means of a corresponding resistor, and the output end of the current detection feedback circuit is connected to the input end of at least one stage of amplifier circuit prior to the current stage of amplifier circuit. The current detection feedback circuit generates, according to the detected quiescent operating current of the current stage of amplifier circuit, a control voltage varying inversely with the quiescent operating current, so that the current detection feedback circuit outputs current varying positively with the control voltage.

Provided is an amplifier including: a first transistor connected to a signal input terminal; a second transistor connected to a signal output terminal; a wiring line configured to connect the first transistor and the second transistor to each other; and a variable inductor circuit which is electrically connected to the wiring line, and is grounded via a capacitor for DC current interruption, wherein the inductance value of the variable inductor circuit is set to an inductance value for canceling a parasitic capacitance between the first transistor and the second transistor.

A circuit including an amplifier having an input and an output. The circuit also includes a current-to-voltage amplifier having an input. The circuit further includes a current mirror coupled between the output of the amplifier and the input of the current-to-voltage amplifier. The current mirror is configured to chop current flowing through the first current mirror.

A reactance cancelling radio frequency (RF) circuit array is disclosed. The reactance cancelling RF circuit array includes multiple RF circuits each coupled to one or two adjacent RF circuits by one or two pairs of coupling mediums each having a respective length less than one-quarter wavelength. In one aspect, an RF input signal is first split across the RF circuits and then combined to form an RF output signal. As a result, each RF circuit requires a lower power handling capability to process a portion of the RF input signal. In another aspect, each pair of the coupling mediums can cause reactance cancellation in each reactance-cancelling pair of the RF circuits. By coupling the RF circuits via the coupling mediums and enabling splitting-combining among the RF circuits, it is possible to miniaturize the reactance cancelling RF circuit array for improved performance across a wide frequency spectrum.

Disclosed is an operational amplifier, including a first-stage gain circuit, a second-stage gain circuit, and a tail current compensation circuit. The first-stage gain circuit is connected to the second-stage gain circuit, the first-stage gain circuit is provided with an input terminal, the second-stage gain circuit is provided with an output terminal. The first-stage gain circuit at least includes a tail current source, a first terminal of the tail current compensation circuit is connected to the tail current source, and a second terminal of the tail current compensation circuit is connected to the output terminal of the second-stage gain circuit. The tail current compensation circuit is configured to compensate the tail current source with an output signal of the output terminal of the second-stage gain circuit.