Signal mixing circuit device and receiver

A signal mixing circuit device, comprising:

• a first mixer;
• a second mixer;
• and
• a signal amplifying circuit connected in serial with the first mixer,
• wherein the first mixer includes an RF signal input terminal configured to receive an RF signal, LO signal input terminals configured to sample a first LO signal and a second LO signal, a first mixed-signal output terminal configured to output a first mixed signal, and a second mixed-signal output terminal configured to output a second mixed signal, and the first and second mixed-signal output terminals of the first mixer are connected to the signal amplifying circuit, and
• wherein the second mixer includes an input terminal connected to a capacitor, a first mixed-signal output terminal which is connected to the first mixed-signal output terminal of the first mixer, a second mixed-signal output terminal which is connected to the second mixed-signal output terminal of the first mixer, and LO signal input terminals configured to inversely sample the first LO signal and the second LO signal.