AM/FM tuner saw filter-less architecture using AM frequency band up-conversion
OwnerG. Tyson Tuttle, Dan B. Kashainventors
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Abstract
A receiver for AM and FM broadcast signals is disclosed. FM signals are received from an FM antenna and then processed by receive path circuitry or an FM tuner integrated circuit (IC) to produce audio output signals, such as digital audio output signals. The AM signals are received by an AM antenna and then up-converted using a fixed-clock to a frequency range nearer to the FM signal frequencies. The up-converted AM frequencies are then processed using the receive path circuitry. A multiplexer (MUX) allows for selection of the FM signals or the up-converted AM signals to be passed through for signal processing.
Claims20
An AM/FM receiver using AM frequency band up-conversion, comprising:
- a mixer coupled to mix an input AM signal from an AM antenna with a fixed clock signal to generate an up-converted AM signal;
- a multiplexer coupled to receive an input FM signal from an FM antenna and the up-converted AM signal, the multiplexer being configured to receive a band selection signal that determines whether the up-converted AM signal or the FM signal is output by the multiplexer;
- and
- receive path circuitry configured to receiver the output of the multiplexer, configured to tune an AM channel within the up-converted AM signal if the band selection signal has selected the up-converted AM signal, and configured to tune an FM channel within the FM signal if the band selection signal has selected the FM signal.
A method for receiving AM and FM signals using AM frequency band up-conversion, comprising:
- receiving an input AM signal and an input FM signal;
- selecting to process the input AM signal using AM processing or to process the input FM signal using FM processing;
- if FM processing is selected, tuning an FM channel within the FM signal;
- and
- if AM processing is selected, first mixing the input AM signal with a fixed clock signal to generate an up-converted AM signal and then tuning an AM channel within the up-converted AM signal.
Dependencies are inferred from the claim text.