Multiple band local oscillator frequency generation circuit
AssigneeKoninklijke Philips Electronics N.V.
InventorsWilhelm S. Hahn, Emmanuel Riou
Life of this patent
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Abstract
A multi-band local oscillator for generating an output oscillator signal of a desired frequency is implemented with a single voltage controlled oscillator providing an input oscillator signal and a switch divider block. The output signal is passed through a selected one of a set of filters for band switching and through a frequency divider and subsequently mixed with the input oscillator signal of the voltage controlled oscillator.
Claims11
A local oscillator (LO) circuit for generating an output LO frequency signal from an input frequency signal, comprising:
- a direct signal path and a feedback signal path;
- a switch circuit in said feedback signal path comprising a switch and a plurality of filters, the switch circuit being configured to selectively filter the output LO frequency signal through one of the filters to produce a filtered frequency signal;
- a frequency divider in said feedback signal path that is configured to multiply a frequency of the filtered frequency signal by a preset ratio for generating a secondary output frequency signal;
- and
- a mixer in said direct signal path that is configured to mix the input frequency signal with the secondary output frequency signal to generate the output LO frequency signal.
A device comprising:
- a local oscillator (LO) circuit for generating an output LO frequency signal from an input frequency signal, the circuit comprising:
- a direct signal path and a feedback signal path;
- a switch circuit in said feedback signal path comprising a switch and a plurality of filters, the switch circuit being configured to filter the output LO frequency signal through one of the filters to produce a filtered frequency signal;
- a frequency divider in said feedback signal path that is configured to multiply a frequency of the filtered frequency signal by a preset ratio for generating a secondary output frequency signal;
- and
- a mixer in said direct signal path that is configured to mix the input frequency signal with the secondary output frequency signal to generate the output LO frequency signal.
A communication system comprises an access point and at least one mobile station for communicating over a wireless medium, one of the access point or the mobile station comprising:
- a local oscillator (LO) circuit for generating an output LO frequency signal from an input frequency signal, the circuit comprising:
- a direct signal path and a feedback signal path;
- a switch circuit in said feedback signal path comprising a switch and a plurality of filters, the switch circuit being configured to filter the output LO frequency signal through one of the filters to produce a filtered frequency signal;
- a frequency divider in said feedback signal path that is configured to multiply a frequency of the filtered frequency signal by a preset ratio for generating a secondary output frequency signal;
- and
- a mixer in said direct signal path that is configured to mix the input frequency signal with the secondary output frequency signal to generate the output LO frequency signal.
Dependencies are inferred from the claim text.