Temperature compensation circuitry

An oscillator comprising:

• (a) means for providing a signal at an output thereof having a predetermined amplitude;
• (b) means for feeding at least a portion of said signal back to an input of said amplitude means, said feedback means comprising:
• (i) means for providing a predetermined phase shift characteristic to said signal fed to the input of the amplitude means relative to the phase of the signal provided from the output of the amplitude means comprising:
• (a) means for supporting surface wave propagation having a surface wave velocity characteristic which varies in a first predetermined manner as a function of temperature;
• (b) input and output transducers, each coupled to said surface wave propagation means;
• (c) wherein said signal is fed to the input transducer and received at the output transducer and is provided with a predetermined phase shift and a predetermined phase shift temperature dependent variation in accordance with the surface wave velocity characteristic and temperature dependent variation in surface wave velocity of the surface wave support means;
• (ii) means, including at least one passive reactive element having a predetermined reactance variation as a function of the temperature of the element, and disposed to react to the temperature of the phase shift means for providing, said signal with a substantially invariant delay variation as a function of temperature.

A delay element comprising:

• means, operative over a predetermined temperature range, for providing an output signal having a predetermined, nominal delay with respect to an input signal fed to an input of the delay means, such delay varying from such nominal delay over the predetermined operating temperature range of the delay means, said means further comprising:
• (i) means for supporting surface wave propagation having a surface wave velocity characteristic which varies in a predetermined manner over said temperature range;
• (ii) an input transducer fed by the input signal and an output transducer providing said output signal, said transducers each being coupled to said surface wave propagation means;
• means, including an electrical component having a temperature dependent electrical characteristic and disposed to have the temperature dependent electrical characteristic thereof respond to the operative temperature of the delay means, said electrical component being electrically coupled to the delay means, for providing a temperature compensating delay to the signal fed to the delay element, such signal passing through the delay means and the electrical component of the temperature compensating delay means, such compensating delay varying with the temperature dependent electrical characteristic of the electrical component to provide the delay element with a substantially temperature invariant delay characteristic over the predetermined operating range.

An inductor comprising:

• a pair of solenoids connected in parallel;
• a body comprised of a magnetic material disposed within portions of each of said solenoids;
• and
• means for displacing said magnetic material within said solenoids as a function of changes in temperature to provide said inductor with a parabolic inductance variation in accordance with said changes in temperature.

A capactior comprising:

• a center conductive member;
• a pair of mutually spaced conductive members, coaxially disposed around and each being dielectrically spaced from said center conductive member, and each member arranged to be capacitively coupled to a portion of said center conductive member;
• and
• means for displacing in an axial direction in accordance with variations in temperature a first one of the center conductive member and pair of spaced conductive members with respect to a second one of the center conductive member and pair of spaced conductive members.