Voltage regulation using a delta-sigma modulator, device and method
It is described a voltage regulator device ( 100 ), comprising: i) a power device ( 150 ), configured to receive an input signal ( 151 ) and to produce a corresponding output signal ( 152 ); ii) a comparator device ( 110 ), coupled via a feedback path ( 140 ) to the power device ( 150 ), and configured to receive the output signal ( 152 ) as a feedback signal ( 141 ), and to produce a compared feedback signal ( 112 ); and iii) a digital modulation device ( 120 ), arranged between the comparator device ( 110 ) and the power device ( 150 ), and configured to digitally modulate the compared feedback signal ( 112 ), and to provide the digitally modulated signal ( 121 ) to the power device ( 150 ), wherein the digital modulation device ( 120 ) comprises: iiia) a delta-sigma ( 122 ), iiib) a quantizer ( 124 ), and iiic) a feedforward path ( 128 ), configured to feedforward the compared feedback signal ( 112 ) beyond the delta-sigma ( 122 ).
1. A voltage regulator device, comprising:
a power device, configured to receive an input signal and to produce a corresponding output signal;
a comparator device, coupled via a feedback path to the power device, and configured to
receive the output signal as a feedback signal, and
produce a compared feedback signal;
a digital modulation device, arranged between the comparator device and the power device, and configured to
digitally modulate the compared feedback signal, and
provide a digitally modulated signal to the power device,
wherein the digital modulation device comprises:
a delta-sigma,
a quantizer, and
a feedforward path, configured to feedforward the compared feedback signal beyond the delta-sigma; and
a driver device arranged between the digital modulation device and the power device, wherein the feedforward path is configured to feedforward the compared feedback signal to the driver device.
2. The voltage regulator device according to claim 1 ,
wherein the digital modulation device comprises a pulse density modulation, PDM, device.
3. The voltage regulator device according to claim 1 , wherein the quantizer is a multi-bit quantizer.
4. The voltage regulator device according to claim 1 , wherein the digital modulation device further comprises:
a digital modulation feedback path, configured to feed-back the output of the quantizer to the delta-sigma.
5. The voltage regulator device according to claim 1 , wherein the feedforward path is configured to feedforward the compared feedback signal to a coupling between the delta-sigma and the quantizer.
6. The voltage regulator device according to claim 1 , further comprising:
a level shifter arranged between the comparator device and the digital modulation device.
7. The voltage regulator device according to claim 1 , wherein the comparator device is part of an analog domain, and
wherein the digital modulation device is part of a digital domain.
8. The voltage regulator device according to claim 1 , wherein the voltage regulator device is configured as a low dropout, LDO, device.
9. The voltage regulator device according to claim 1 , wherein the comparator device is configured to compare the feedback signal with a reference voltage to produce the compared feedback signal.
10. The voltage regulator device according to claim 1 , further comprising:
a clock device, configured to provide a clock signal to the digital modulation device.
11. The voltage regulator device according to claim 10 ,
wherein the clock device is further configured to provide a further clock signal to the comparator device.
12. The voltage regulator device according to claim 1 , wherein the power device comprises a plurality of power units configured as power switches.
13. A method of operating a voltage regulator device, comprising:
receiving an input signal and producing a corresponding output signal by a power device;
receiving the output signal as a feedback signal and producing a compared feedback signal by a comparator device;
digitally modulating the compared feedback signal by a digital modulation device that comprises a delta-sigma and a quantizer to obtain a digitally modulated signal;
providing the digitally modulated signal to the power device;
wherein the method further comprises:
feeding forward the compared feedback signal via a feedforward path beyond the delta-sigma, and
feeding forward the compared feedback signal to a driver device.
14. The method of claim 13 , further comprising feeding back an output signal of the quantizer to the delta-sigma of the digital modulation device by way of a digital modulation feedback path to obtain the digitally modulated signal.
15. The method of claim 13 , wherein feeding forward the compared feedback signal via the feedforward path further comprises feeding forward the compared feedback signal to a coupling between the delta-sigma and the quantizer.
16. The method of claim 13 , further comprising comparing the feedback signal with a reference voltage by way of the comparator device to produce the compared feedback signal.
17. The method of claim 13 , further comprising providing a clock signal to the digital modulation device by way of a clock device.
18. The method of claim 13 , wherein the voltage regulator device) is configured as a low dropout, LDO, device.