Wireless terminal device

Details Wireless terminal device Wireless terminal device

2006-05-30

2006-05-30

Maung, Nay (Department: 2684)

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

C455S213000, C455S258000, C455S337000

Reexamination Certificate

active

07054610

ABSTRACT:
In a cellular telephone provided with a receiving circuit of a direct conversion type, a passive low-pass filter is arranged between a mixer for an I-channel and a base band circuit for removing interference waves of or above a channel next to a channel neighboring to the I-channel, and another passive low-pass filter is arranged between a mixer for a Q-channel and the base band circuit for removing interference waves of or above a channel next to a channel neighboring to the Q-channel. Since the low-pass filters for removing the interference waves of or above the channel next to the neighboring channel are of a differential type, the circuit scale can be small, and the power consumption is small. Since the interference waves are removed by the passive low-pass filters and the active low-pass filters, only the desired channel can be reliably received.

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Shimozawa et al., “A Monolithic Even Harmonic Quadrature Mixer Using a Balance Type 90 Degree Phase Shifter for Direct Conversion Receivers”; 1998 IEEE Radio Frequency Integrated Circuits Symposium; 1998 IEEE Baltimore, MD, USA, Jun. 7-9, 1998; New York, NY, USA, IEEE Jun. 7, 1998; pp. 209-212.

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