Dual band VCO
AssigneeTelefonaktiebolaget LM Ericsson C Pub
InventorMagnus Nilsson
Life of this patent
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Abstract
A radio ASIC including a VCO (30) connected to both a homodyne receiver (60, 80, 90, 110, 120, 140, 150) for downconting the frequency of a received signal, when said radio ASIC is in a receiving mode (110, 120, A), and to a radio transmitter (70, 100, 110, 120) for transmitting another signal, when said radio ASIC is in a transmitting mode (110, 120, B). A divider (50) with a dividing factor of two is arranged between the VCO (30) and a mixer (80, 140) of the homodyne receiver in order to divide the signal from the VCO with a factor of two. The VCO is run on double GSM-RX-frequency implying that it covers both PCS-TX (radio ASIC in transmission mode) and GSM-RX (radio ASIC in receiving mode).
Claims7
A radio circuit comprising a receiver, a transmitter and a VCO, wherein said VCO is connected both to said receiver, for converting the frequency of a received signal, when said radio circuit is in a receiving mode, and to said transmitter for transmitting another signal, when said radio circuit is in a transmitting mode, said VCO oscillating on double GSM-frequencies controlling both transmitting bands on double GSM-frequencies and receiving bands on GSM-frequencies.
Dependencies are inferred from the claim text.