| 摘要 |
The principle of the design lies in connecting the modulating signal directly to the inputs of two analogue switches (1) and (2), whose outputs (13) and (23) deliver the modulated signals via two operational amplifiers (3) and (4), which are connected as impedance converters, into the inverting (52) and non-inverting (51) input of the operational amplifier (5), which is connected as a balanced amplifier with the single gain with inverting and non-inverting transmission. The connection can be used in devices where one requires simple setting and activation, high excitation ability with the sufficient signal-to-noise ratio, circuit simplicity and easy serviceability.<IMAGE>
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