Selecting modulation and amplification in a transmitter
AssigneeCambridge Silicon Radio Limited
InventorsPeter WOOD, Simon Howden MORRIS, Timothy John NEWTON, Peter William STEPHENSON
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Abstract
A transmitter for transmitting signals, comprising: a modulator for modulating a data signal, the modulator being capable of modulating the data signal according to any of two or more modulation schemes to form a modulated signal; an amplification arrangement for amplifying the modulated signal with any of two or more levels of gain; and a control system configured to interdependently select one of the modulation schemes and one of the levels of gain, and to control the modulator to adopt the selected modulation scheme and to control the amplifier to adopt the selected level of gain.
Claims22
A transmitter for transmitting signals, comprising:
- a modulator for modulating a data signal, the modulator being capable of modulating the data signal according to any of two or more modulation schemes to form a modulated signal;
- an amplification arrangement for amplifying the modulated signal with any of two or more levels of gain;
- and
- a control system configured to interdependently select one of the modulation schemes and one of the levels of gain, and to control the modulator to adopt the selected modulation scheme and to control the amplifier to adopt the selected level of gain.
A transmitter for transmitting signals, comprising:
- a modulator for modulating a data signal, the modulator being capable of modulating the data signal according to any of two or more modulation schemes to form a modulated signal;
- an amplification arrangement for amplifying the modulated signal with any of two or more levels of gain;
- and
- a control system configured to select one of the modulation schemes and one of the levels of gain, and to control the modulator to adopt the selected modulation scheme and to control the amplifier to adopt the selected level of gain, the control system being configured for operation in:
- a first mode in which it is restricted to selecting a subset of combinations of the available modulation schemes and available levels of gain, which subset excludes the combination of one modulation scheme and levels of gain greater than a threshold and includes the combination of that modulation scheme and levels of gain below that threshold, and includes the combination of one other modulation scheme and levels of gain above that threshold;
- and
- a second mode in which it is restricted to selecting a subset of combinations of the available modulation schemes and available levels of gain, which subset excludes the combination of any of the modulation schemes with levels of gain greater than a threshold.
Dependencies are inferred from the claim text.