Oscillator
A technology of oscillators and oscillating signals, used in power oscillators, electrical components, automatic control of power, etc.
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no. 1 example
[0029] figure 2 is a circuit diagram of an oscillator according to a first embodiment of the present invention. figure 2 The oscillator shown is a variant of the Colpittz oscillator, constructed as follows. The collector of the transistor TR for feedback receives the supply voltage applied through the supply terminal P1. The first capacitor C1 is connected between the base and emitter of the transistor TR. The second capacitor C2 is connected between the first capacitor C1 and ground. The resistor R1 is connected between the collector and the base of the transistor TR. The first inductor L1 of the resonance circuit is connected between the base of the transistor TR and ground. The second inductor L2 is connected between the emitter of the transistor TR and the first inductor L1.
[0030] It should be noted that figure 2 The circuit configuration shown in FIG. 1 does not have the bias resistor R2 connected between the base of the transistor TR and ground and the bias resi...
no. 2 example
[0034] image 3 is a circuit of an oscillator according to a second embodiment of the present invention. The oscillator includes an oscillation circuit 30 , a matching circuit 41 , a buffer circuit 42 and an impedance adjustment circuit 43 . The oscillation circuit 30 generates an oscillation signal, which is applied to an output terminal 44 through a matching circuit 41 , a buffer circuit 42 and an impedance adjustment circuit 43 . The matching circuit 41 DC-isolates the oscillation circuit 30 and the buffer circuit 42 . When the oscillating signal has a frequency up to several GHz, the matching circuit 41 is preferably employed. The buffer circuit 42 amplifies the oscillation signal. The impedance adjustment circuit 43 establishes impedance matching between the oscillator and an external circuit connected to the output terminal 44 .
[0035] The oscillation circuit 30 includes a resonance circuit 31 and a drive circuit having an oscillation transistor 32 . The resonance...
no. 3 example
[0042] Figure 4 is a circuit diagram of an oscillator according to a third embodiment of the present invention.
[0043] The output terminal 37 is connected to the connection node of the inductor 33 and the capacitors C3, C6 and C7. That is, an oscillation output is extracted from the resonance circuit 31 . The resonance signal available at the inductor 33 is relatively large. The buffer circuit 42 receives an oscillation (resonance) signal through the output terminal 37 and amplifies it.
[0044] Figure 11 show Figure 4 A variation of the circuit configuration shown in . Figure 11 Inductor 35 shown in is not connected to inductor 33 but is grounded. Figure 11 The circuit shown in the Figure 4 The circuit shown in works in the same way.
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