초록 ▼

A chopper stabilized bandgap voltage reference circuit comprises current mirror circuitry mirroring first and second currents into first and second networks to generate a forward diode voltage signal and a PTAT (proportional to absolute temperature) component signal, and a third current having a der

A chopper stabilized bandgap voltage reference circuit comprises current mirror circuitry mirroring first and second currents into first and second networks to generate a forward diode voltage signal and a PTAT (proportional to absolute temperature) component signal, and a third current having a derived temperature coefficient into a third network to generate a reference voltage signal for a regulator. An amplifier amplifies a differential signal of the forward diode voltage signal and the PTAT component signal to output a fourth current to control the first and second currents. According to a chopper clock, a modulator modulates the differential signal to be supplied to the amplifier and a demodulator demodulates the fourth current. A gain loop compensation circuit is coupled to the demodulator to compensate the amplifier, and filter the fourth current for noise components, and a bypass circuit is also provided to the third network for filtering the third current.

대표청구항 ▼

What is claimed is: 1. A current mode chopper stabilized bandgap voltage reference circuit for a regulator comprising:current mirror circuitry configured for mirroring first and second currents into first and second networks to generate a forward diode voltage signal and a PTAT (proportional to abso

What is claimed is: 1. A current mode chopper stabilized bandgap voltage reference circuit for a regulator comprising:current mirror circuitry configured for mirroring first and second currents into first and second networks to generate a forward diode voltage signal and a PTAT (proportional to absolute temperature) component signal, respectively, and a third current having a derived temperature coefficient based on the first and second currents into a third network to generate a reference voltage signal to be supplied to the regulator;an amplifier configured for amplifying a differential signal of the forward diode voltage signal and the PTAT component signal to output a fourth current to control the first and second currents in the first and second diode networks;a modulator coupled between the current mirror circuitry and the amplifier, synchronized to a chopper clock, and configured for modulating the differential signal to be supplied to the amplifier;a demodulator coupled to the amplifier, synchronized to the chopper clock, and configured for demodulating the fourth current;a gain loop compensation circuit coupled to the demodulator to compensate the amplifier, and filter the fourth current for noise components; anda bypass circuit provided to the third network for filtering the third current.