Patent ID: 11936436
Assignee: ROHDE & SCHWARZ GMBH & CO. KG
Field: Telecommunications (Electrical engineering)
Classification: CPC H | IPC H

Claim 17:
18. An external frontend device, comprising:
an integrated synthesizer circuit;
a reference signal input configured to receive a low-frequency reference signal from an electronic device that is established separately from the external frontend device, wherein the external frontend device is configured to be placed in a test chamber, wherein the electronic device is a measurement instrument or a signal generator placed outside the test chamber, wherein a frequency of the low-frequency reference signal is smaller than or equal to 2 GHz, wherein the reference signal input is configured to forward the received low-frequency reference signal to the integrated synthesizer circuit, and wherein the integrated synthesizer circuit is configured to generate a local oscillator (LO) signal based on the low-frequency reference signal;
a receiver channel and/or a transmitter channel;
at least one mixer circuit associated with the receiver channel and/or with the transmitter channel, wherein the at least one mixer circuit is configured to mix the LO signal with a radio frequency (RF) signal processed by the receiver channel and/or or with an intermediate frequency (IF) signal processed by the transmitter channel, thereby obtaining an IF output signal and/or or an RF output signal, respectively;
an IF correction circuit comprising a comb-signal input, wherein the comb-signal input is configured to receive a comb-signal, wherein the IF correction circuit is configured to correct the IF signal and/or the IF output signal based on the received comb-signal, and wherein the IF correction circuit is established separately from the integrated synthesizer circuit; and
a power detector connected to the IF correction circuit, wherein the power detector is configured to perform power measurements in order to correct the IF signal and/or the IF output signal.