摘要:
Bei einem als Frequenz- und/oder Phasenmodulator wirkenden spannungsgesteuerten Oszillator mit Leitungsresonator und variierbaren Beschaltungskapazitäten wird der Modulationszweig der Beschaltungskapazitäten zwischen den Resonatorenden an den Leitungsresonator angekoppelt, wobei die Lage des Ankoppelpunktes so gewählt ist, daß der Frequenzhub der Modulation über einen größeren Trägerfrequenzbereich im wesentlichem konstant ist.
摘要:
Bei einem als Frequenz- und/oder Phasenmodulator wirkenden spannungsgesteuerten Oszillator mit Leitungsresonator und variierbaren Beschaltungskapazitäten wird der Modulationszweig der Beschaltungskapazitäten zwischen den Resonatorenden an den Leitungsresonator angekoppelt, wobei die Lage des Ankoppelpunktes so gewählt ist, daß der Frequenzhub der Modulation über einen größeren Trägerfrequenzbereich im wesentlichem konstant ist.
摘要:
The SSB modulator according to the present invention is comprised of a driving voltage generator (5), a diode (3), a bias supply circuit (4), an impedance transformation circuit (2) and an input/output terminal (1). It is so arranged in the SSB modulator that the impedance of the diode (3) is changed by changing the driving voltage impressed to the diode (3), resulting in the mismatching of the impedance, which leads to generation of the reflected wave. Therefore, by changing the amplitude and the phase of the above-obtained reflected wave, SSB modulation is effected. Accordingly, the SSB modulator of the present invention requiring no particular side band filter is compact in size, light and weight and low in manufacturing cost, with a simple structure of the circuit.
摘要:
The frequency modulator utilizing a frequency synthesizer comprises a voltage controlled oscillator (VCO-2), a programable frequency divider (4), a reference oscillator (8), a phase comparator and a phase locked loop. The VCO (2) comprises a first variable capacitor (24) receiving the control voltage from the phase comparator (6) and a second variable capacitor (26) receiving an input modulation signal. A bias circuit controls a bias to be supplied to the second variable capacitor (26) in accordance with the control voltage delivered from the phase comparator (6). An undesirable change of the modulation sensitivity due to difference of the oscillation frequency is compensated by controlling the reverse bias to be applied to the second variable capacitor (26) receiving the input modulation signal depending on the frequency control voltage for the VCO (2).
摘要:
The SSB modulator according to the present invention is comprised of a driving voltage generator (5), a diode (3), a bias supply circuit (4), an impedance transformation circuit (2) and an input/output terminal (1). It is so arranged in the SSB modulator that the impedance of the diode (3) is changed by changing the driving voltage impressed to the diode (3), resulting in the mismatching of the impedance, which leads to generation of the reflected wave. Therefore, by changing the amplitude and the phase of the above-obtained reflected wave, SSB modulation is effected. Accordingly, the SSB modulator of the present invention requiring no particular side band filter is compact in size, light and weight and low in manufacturing cost, with a simple structure of the circuit.