公开(公告)号：US20230417799A1

公开(公告)日：2023-12-28

申请号：US17850120

申请日：2022-06-27

申请人： VIAVI SOLUTIONS INC.

发明人： Chang-Hyun PARK ,  Bon-Jin KU ,  Seung-Gon HONG

IPC分类号： G01R13/02 ,  G01R23/167 ,  G01R31/00

CPC分类号： G01R13/0272 ,  G01R23/167 ,  G01R31/001

摘要： A multi-channel analog-digital converter (ADC) subsystem for test device such as a spectrum analyzer may include multiple multi-channel ADCs to receive down-converted signals and convert the received signals to digital output signals, a field programmable gate array (FPGA) to select one or more ADCs based on a frequency, a bandwidth, and/or a signal type of each received signal and a characteristic of each ADC, and an ADC sample clock to provide a clock signal to the selected ADCs. Characteristics of the ADCs may include a resolution, a signal-to-noise-and-distortion ratio (SINAD), an effective number of bits (ENOB), a signal-to-noise ratio (SNR), a total harmonic distortion (THD), a total harmonic distortion plus noise (THD+N), and/or a spurious free dynamic range (SFDR).

公开(公告)号：US20240106551A1

公开(公告)日：2024-03-28

申请号：US17953943

申请日：2022-09-27

申请人： VIAVI SOLUTIONS INC.

发明人： Bon-Jin KU ,  Seung-Gon HONG ,  Chang-Hyun PARK

IPC分类号： H04B17/29

CPC分类号： H04B17/29

摘要： A radio frequency (RF) test device such as a spectrum analyzer may include an RF attenuator to attenuate a received RF signal; a mixer to down-convert the attenuated RF signal; an IF attenuator to attenuate the down-converted signal; an analog-to-digital converter (ADC) to digitize the attenuated, down-converted signal; and a processor, which may select attenuation values for one or more of the RF attenuator and the IF attenuator based on an error magnitude vector (EVM) analysis, an RF signal type, and/or a signal level at an input of the ADC. The processor may use a look-up table for the selection. Initial attenuation values may be selected based on an expected RF signal type, RF signal frequency, and/or RF signal bandwidth. The attenuation values may also be selected in an iterative manner stepping the attenuation values up or down.