Abstract An oscillator circuit which comprises a quartz crystal operating in parallel resonance, a MOS transistor, forming the active component of the circuit, and means for setting the amplitude of the periodic signal delivered by the circuit. These means include another MOS transistor, in series with the first, and a voltage source, e.g. an amplifier, for controlling the second transistor, said source delivering a continuous signal having a value sufficient to place the second transistor in current saturation conditions. Both transistors are preferably of the ''''enhancement'''' type. Such a circuit, although it would be supplied by a low voltage source, would only consume a very small amount of power.
An oscillator circuit comprising a quartz crystal operating in parallel resonance, a first insulated-gate field-effect transistor, forming the active component of the circuit, a second insulated-gate field-effect transistor, in series with said first transistor, and a voltage source connected to the gate of said second transistor and delivering a continuous signal having a value sufficient to place said second transistor in current saturation conditions.
Claim 2
Dependent Claim
64 words
An oscillator circuit comprising a quartz crystal operating in parallel resonance, a first insulated-gate field-effect transistor, forming the active component of the circuit, a second insulated-gate field-effect transistor, in series with said first transistor, and a voltage source connected to the gate of said second transistor and delivering a continuous signal having a value sufficient to place said second transistor in current saturation conditions.
Claim 3
Dependent Claim
16 words
An oscillator circuit according to claim 1, wherein said transistors are of the so-called ''''enhancement'''' type.
Claim 4
Dependent Claim
44 words
An oscillator circuit according to claim 1, wherein said control voltage source includes an amplifier which is controlled by a signal derived from the output signal of the oscillator circuit and which is connected by its output to the gate of said second transistor.
Claim 5
Dependent Claim
76 words
An oscillator circuit according to claim 3, wherein said amplifier comprises a resistor and a third insulated-gate field-effect transistor which are series connected with a continuous voltage supply source, the gate of said third transistor being connected to the point of connection between two capacitors forming a divider of the periodic voltage delivered by the oscillator, the point of connection of said resistor with said third transistor being connected to the gate of said second transistor.