3 results about "High gain amplifier" patented technology

Amplifier (10) with high gain and high tracking speed, comprising: a pair of input transistors (MNP 12, MNN 14) to which input voltages (IN+ and IN-) are applied; a pair of loads switched as diodes (MPP 16, MPN 18) connected to the input transistors (MNP 12, MNN 14); at least a pair of current sources (MPIP 20, MPIN 22) connected to the loads switched as diodes (MPP 16, MPN 18);and a bias control (28) designed to switch off the at least one pair of current sources (MPIP 20, MPIN 22) to enable a high tracking speed for the amplifier (10), wherein the bias control (28) switches off the current sources (MPIP 20, MPIN 22) during a coarse tracking mode of the amplifier (10) when the amplifier (10) is tracking, and to switch on the at least one pair of current sources (MPIP 20, MPIN 22) to enable a high gain for the amplifier (10), and wherein the bias control (28) switches on at least one pair of current sources (MPIP 20, MPIN 22) at the end of the tracking and leaves the current sources (MPIP 20, MPIN 22) switched on when the amplifier (10) is not tracking.

The present application relates to the field of array signal processing, and particularly relates to a high linearity pipeline ADC front-end sampling circuit. In the traditional structure, the sampling current of MDAC and Sub-ADC flows through the output impedance of the input signal source at the same time, which leads to signal-dependent voltage drop and thus introduces nonlinear error. The technical scheme of the present application is to construct a compensation circuit in the Sub-ADC branch, which is opposite in polarity to the input current of the MDAC branch, so that the input currents of the two branches are offset on the output impedance of the signal source, thereby significantly reducing the nonlinear distortion. The present application does not require additional high-gain amplifiers or complex calibration algorithms, and can effectively suppress the nonlinear caused by the input current through circuit structure optimization, and is suitable for high-speed high-precision pipeline ADC design.

The present application belongs to the field of power management in analog integrated circuits, and particularly relates to a digital auxiliary analog off-chip capacitor-free low-dropout linear voltage regulator; comprising a control module, a bandgap reference circuit, a transient enhancement circuit, a transient enhancement power tube group, an analog loop and a digital loop; in a load steady state, an analog LDO is used as a main control scheme, a high-gain amplifier can obtain an accurate output voltage, and limit cycle oscillation does not occur. Only when a load transient occurs, a digital LDO is called as a main control scheme, so as to improve speed, reduce static current and suppress switching noise. On-chip integration, high-precision output voltage, wide load current range, fast transient response speed, high-efficiency power tube area utilization and low output ripple can be realized. The circuit can be applicable to SoC modular power management and digital IP load.