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专利名称：Apparatus for suppressing the appearance
of transient responses or spikes
发明人：FURUKAWA TOMOZO,WAKAYAMA NAOAKI申请号：US338753申请日：190120公开号：US3307044A公开日：19670228
摘要：1,043,562. Transistor circuits. NIHON GENSHIRYOKU KENKYU SHO. Jan. 13, 19[Jan. 22, 1963], No. 1395/. Heading H3T. In a transistor chopper for a chopper-modulatortype amplifier, transient responses in the output waveform due to
interelectrode capacitance and/ or resistance in the transistor are reduced by applyingthe chopping waveform inverted with respect to that applied to the chopping transistorto the output terminal through a resistance-capacitance a like network equivalent to theinter-electrode capacitance and/or resistance referred to above. In Fig. 3 the input signalis applied to terminal 31 and the chopped waveform is taken from terminal 34. Thechopping waveform is applied to terminal 32 and an inverted signal is applied to terminal33, firstly to develop a voltage across the resistor in series with the transistor balancingout the residual voltage across the transistor when conducting and secondly to
compensate for transients appearing in the output due to the switching waveform beingcoupled thereto through the base-emitter capacitance of the transistor, this lattercompensation being achieved by a voltage fed through resistor 36 and capacitor 35. InFig. 4 the transientcompensating waveform is effectively added to the output by beingapplied to the transistor together with the residual.voltage-balancing waveform. In Fig. 5
the impedances presented by a second transistor 45 are used to compensate for thetransients appearing at the output of the chopping transistor. By this means timedelayeffects due to minority-carrier storage may be compensated for. Voltage sensitivity ofthe inter-electrode resistance and capacitance of the chopping transistor are similarlycompensated for.
申请人：NIHON GENSHIRYOKU KENKYU SHO
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