Signal processing circuit and signal processing device

A signal processing circuit for processing a radio frequency(RF) signal received from a device under test, the signal processing circuit comprising:

• at least two signal processing channels, wherein the at least two signal processing channels comprise a first signal processing channel and a second signal processing channel, wherein the first signal processing channel and the second signal processing channel are each configured to process the same RF signal,
• wherein the first signal processing channel comprises a first analog-to-digital converter, ADC, the first ADC being configured to digitize the RF signal, thereby obtaining a first digitized RF signal,
• wherein the second signal processing channel comprises a second ADC, the second ADC being configured to digitize the RF signal, thereby obtaining a second digitized RF signal,
• wherein the signal processing circuit comprises a first clock input being configured to receive a first clock signal,
• wherein the signal processing circuit comprises a second clock input being configured to receive a second clock signal,
• wherein the signal processing circuit comprises a clock distribution circuit, the clock distribution circuit being configured to forward the first clock signal to the first ADC, the clock distribution circuit further being configured to forward the second clock signal to the second ADC, and
• wherein the signal processing circuit further comprises an averaging circuit, wherein the averaging circuit is connected to both the first signal processing channel and the second signal processing channel, wherein the averaging circuit is configured to determine a combined average of the first digitized RF signal and of a complex conjugate of the second digitized RF signal, thereby obtaining a complex-valued average signal.