Patent ID: 7099647

Claim:
A single chip direct conversion transceiver, comprising: a mixer unit including a first amplifier for amplifying signals received through an antenna, a mixer for eliminating carrier signals from signals output from the first amplifier using a predetermined input reference signal, a low pass filter for eliminating high frequency components from the signals output from the mixer, and a second amplifier for amplifying signals output from the low pass filter; a local oscillator for providing the reference signal to the mixer; a substrate on which the mixer unit and the local oscillator are provided as a circuit; a positive hole formed between the mixer unit and the local oscillator in the substrate to a predetermined width and a predetermined depth and filled with a conductive plug for blocking signal leakage irradiated from the mixer unit and signal leakage irradiated from the local oscillator; a shield ground surface formed above the substrate for blocking signal leakage occurring when the signals received through the antenna are input into the mixer and signal leakage occurring when the reference signal is input into the mixer from the local oscillator; a first interconnection formed above the shield ground surface for connecting the mixer unit and the local oscillator; a first dielectric layer formed between the substrate and the shield ground surface; and a second dielectric layer formed on the shield ground surface to cover the first interconnection.