Electronic amplifiers
AssigneeCrosfield Electronics Limited
InventorJulian M. Coles
Life of this patent
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Abstract
In an electronic amplifier having a floating output stage (42), a demand signal modulates a high frequency carrier (e.g. 20MHz) and the modulated carrier is applied to the floating output stage through a capacitance (10) of very low value (e.g. 1pf) and is then demodulated. The amplifier is preferably a bridge amplifier and each arm of the bridge may comprise a number of floating output stages, each supplied with the modulated carrier through a low-value capacitor (10). As described, the amplifier drives a crystal (40) for modulating electromagnetic radiation from a laser.
Claims14
An electronic amplifier for driving a load in response to a demand signal, comprising:
- a single drive amplifier including means for generating a high frequency carrier and a modulator responsive to the demand signal to modulate the high frequency carrier;
- an output means including a plurality of floating output stages connected in series;
- and a respective capacitance of very low value for each output stage, each said capacitance being connected to couple the modulated carrier from the single drive amplifier to the respective floating output stage and each output stage having a demodulator for said carrier;
- the output means applying the demodulated output signal resulting from the series-connected output stages to the load.
Image reproduction apparatus comprising a laser oscillator, a crystal for modulating electromagnetic radiation derived from the laser oscillator, an electronic amplifier having the crystal connected as its load and responsive to a demand signal to supply a modulating signal to the crystal, the amplifier comprising:
- a single drive amplifier including means for generating a high frequency carrier and a modulator responsive to the demand signal to modulate the high frequency carrier;
- an output means including a plurality of floating output stages connected in series;
- and a respective capacitance of very low value for each output stage, each said capacitance being connected to couple the modulated carrier from the single drive amplifier to the respective floating output stages and each output stage having a demodulator for said carrier;
- the output means applying the demodulated output signal resulting from the series-connected output stages to the load.
Dependencies are inferred from the claim text.