PURPOSE: To obtain the satisfactory linearity even with a high frequency by oscillating an emitter multiple oscillator with 1/2 oscillating frequency and adding together the emitter signals obtained at that time point to obtain a desired double oscillating frequency.
CONSTITUTION: For an emitter multiple oscillator 1, the emitters of transistors (TR) 101 and 102 forming an astable multivibrator are connected together via a capacity 105 and also connected to the collectors of the TRs 103 and 104 respectively. The bases of both TRs 103 and 104 are connected in common to a voltage source 115 with a common emitter connected to a variable current source 113. The voltage waveforms (a) and (b) of the emitters (defined as points A and B respectively) of the TRs 101 and 102 undergo the subtraction with a reference voltage source 4 set at the center voltage Vref of the emitter through subtractors 2 and 3. Then the output waveforms (c) and (d) of both subtractors 2 and 3 are added together by an adder 5. Thus an output waveform (e) is obtained with a frequency double as much as the frequency of the oscillator 1.
OSAKA ICHIRO
HORI KAZUAKI
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