Superheterodyne receiver as well as method and device for improving measurement accuracy thereof

Abstract

The invention discloses a superheterodyne receiver as well as a method and device for improving measurement accuracy thereof. The device comprises an attenuation detection unit, a power calibration unit and a power compensation unit, wherein the attenuation detection unit is used for detecting the attenuation of a programmable attenuator of a superheterodyne receiver when the superheterodyne receiver measures a measured component; the power calibration unit is used for detecting and recording the corresponding power calibration values of the superheterodyne receiver under a plurality of specific attenuation by adjusting the attenuation of the programmable attenuator of the superheterodyne receiver; and the power compensation unit is used for implementing gain compensation on the superheterodyne receiver by using the attenuation measured by the attenuation detection unit and the power calibration values recorded by the power calibration unit, and thus the accuracy of power measurement of the superheterodyne receiver in impedance mismatch can be increased, and as no additional circuit is added to a signal path in which the superheterodyne receiver measures the measured component, the insertion loss cannot be introduced, and time delay also cannot be increased.

Description

technical field [0001] The invention relates to the technical field of measuring instruments, in particular to a superheterodyne receiver and a method and device for improving its measurement accuracy. Background technique [0002] The RF channel of the superheterodyne receiver is a 50 ohm system. Because the port impedance of many devices under test (DUT) in consumer electronics sometimes deviates from 50 ohms, the power measured by the superheterodyne receiver varies with the setting of the programmable attenuator. different from each other. [0003] figure 1 is a functional block diagram of a typical existing superheterodyne receiver, such as figure 1 As shown, the reason why the power measured by the superheterodyne receiver varies with the setting of the programmable attenuator is that the port standing wave of the programmable attenuator in the superheterodyne receiver is often better than that of the frequency conversion unit. The RF signal of the DUT enters the su...

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Problems solved by technology

[0008] The invention provides a superheterodyne receiver and a method and device for improving its measurement accuracy, so as to solve the problem of inaccurate measurement power of the superheterodyne receiver due to impedance mismatch and improve the measurement accuracy of the superheterodyne receiver High degree, avoiding problems such as increasing channel insertion loss or delay in existing solutions

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