VLIF transmitter for Bluetooth
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United States of America Patent
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N/A
Issued Date -
Jun 1, 2006
app pub date -
Sep 15, 2005
filing date -
Sep 15, 2004
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
An RF transmitter suitable for Bluetooth transmissions has an IF modulator and an RF modulator, the IF modulator being arranged to use a very-low-IF-frequency, smaller than half the channel bandwidth, such that spurious unwanted modulation components fall in other channels having a channel number within one or two of a channel being transmitted. This can reduce the VCO pulling problem and reduce adjacent channel power degradation compared to using higher IF frequencies. The local oscillator PLL's fractionality is used in order to optimize the adjacent power frequency plan by selecting the most appropriate IF frequency. For the Bluetooth application, the IF frequency is <500 kHz, and the main non-filtered spurious components (1LOxBB with x: -3, -2, . . . , +3) image, carrier, pulling, for both 0 and 1 FM signals, are positioned in frequency bands of adjacent channels.
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