US 11,742,871 B2
Low power modulator with VCO quantizer
Seong Jin Kim, Ulsan (KR); and Jee Ho Park, Ulsan (KR)
Assigned to UNIST (ULSAN NATIONAL INSTITUTE OF SCIENCE AND TECHNOLOGY), Ulsan (KR)
Filed by UNIST (ULSAN NATIONAL INSTITUTE OF SCIENCE AND TECHNOLOGY), Ulsan (KR)
Filed on Nov. 19, 2021, as Appl. No. 17/531,016.
Claims priority of application No. 10-2020-0156555 (KR), filed on Nov. 20, 2020.
Prior Publication US 2022/0166441 A1, May 26, 2022
Int. Cl. H03M 1/12 (2006.01); H03H 17/02 (2006.01)
CPC H03M 1/1245 (2013.01) [H03H 17/02 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A low power modulator with a VCO quantizer comprising:
an integrator converting an input current to a voltage;
a quantizer converting the converted voltage to digital information;
a filter unit filtering the converted digital information;
a DAC converting the filtered digital information into a feedback current; and
a controller calculating a digital information output based on a difference value between the input current and the feedback current for each sampling time,
wherein the filter unit comprises a digital Infinite Impulse Response (IIR) filter, and
wherein the filter unit is configured to receive a signal of the converted digital information from the quantizer, process a first signal passing through the digital IIR filter, process a second signal without passing through the digital IIR filter, combine the first signal and the second signal to transmit the combined signal to the DAC as the digital information.