Patent ID: 9178538
Filing Date: 2015-11-03
Classification: H03F,H04B

Abstract:
1. A mobile device comprising: a processor block configured to generate a selection signal indicating a selected communications standard for wireless radio frequency (RF) transmission; and a transceiver circuit configured to receive said selection signal and comprising: a variable oscillator configured to generate at least one frequency signal, the input circuitry being configured to perform frequency up conversion of a signal at the output of the at least one analog variable low-pass filter based on the at least one frequency signal, the feedback circuitry being configured to perform a frequency down conversion of a signal at the input of the at least one digital variable low-pass filter based on the at least one frequency signal; and a controller configured to receive the selection signal and generate a first control signal, a second control signal, and a third control signal based on the selection signal, the first control signal being configured to control a first variable cut-off frequency of the at least one analog variable low-pass filter, the second control signal being configured to control a second variable cut-off frequency of the at least one digital variable low-pass filter, the at least one frequency signal being generated by the variable oscillator based on the third control signal.