US 11,700,008 B2
Phase-shifted sampling module and method for determining filter coefficients
Andrew Schaefer, Munich (DE); and Cornelius Kaiser, Munich (DE)
Assigned to Rohde & Schwarz GmbH & Co. KG, Munich (DE)
Filed by Rohde & Schwarz GmbH & Co. KG, Munich (DE)
Filed on Jan. 22, 2021, as Appl. No. 17/156,189.
Prior Publication US 2022/0239306 A1, Jul. 28, 2022
Int. Cl. H03M 1/12 (2006.01); H03K 5/00 (2006.01)
CPC H03M 1/1245 (2013.01) [H03K 5/00 (2013.01); H03K 2005/00286 (2013.01)] 22 Claims
OG exemplary drawing
 
1. A phase-shifted sampling module for sampling a signal, the phase-shifted sampling module comprising:
a primary sampler circuit, an ADC circuit, and an equalization circuit,
the primary sampler circuit comprising an analog signal input, a first signal path, and a second signal path,
wherein the first signal path comprises a first analog sampling unit configured to sample an analog input signal received by the analog signal input, thereby generating a first pre-sampled analog input signal,
wherein the second signal path comprises a second analog sampling unit configured to sample the analog input signal in a phase-shifted manner compared to the first analog sampling unit, thereby generating a second pre-sampled analog input signal,
wherein the ADC circuit comprises a first analog-to-digital converter associated with the first signal path, wherein the first analog-to-digital converter is configured to sample the first pre-sampled analog input signal, thereby generating a first digital output signal,
wherein the ADC circuit comprises a second analog-to-digital converter associated with the second signal path, wherein the second analog-to-digital converter is configured to sample the second pre-sampled analog input signal in a phase-shifted manner compared to the first analog-to-digital converter, thereby generating a second digital output signal, and
wherein the equalization circuit comprises a primary sampler equalizer sub-circuit, wherein the primary sampler equalizer sub-circuit is configured to compensate low-frequency mismatches between the first signal path and the second signal path based on the digital output signals.