Patent ID: 7310024

Claim:
An ovenized oscillator assembly that has reduced sensitivity to ambient pressure changes external to the oscillator assembly, comprising: a) a first temperature controlled oven; b) a crystal that is mounted in the first temperature controlled oven; c) a first substrate having a first and a second side; the first temperature controlled oven with the crystal mounted therein being mounted on the first side of the first substrate; d) an oscillator circuit mounted on the second side of the first substrate and being in close thermal contact with the first temperature controlled oven, the oscillator circuit being operable to produce a reference frequency; e) a first control circuit for controlling the operation of both the temperature of the first temperature controlled oven and the frequency of operation of the oscillator circuit, the first control circuit being mounted against the first temperature controlled oven to be in close thermal contact with the first temperature controlled oven; f) a Faraday shield mounted close to the oscillator circuit; g) a second temperature controlled oven comprising a first case in which are mounted the first temperature controlled oven with the crystal therein, the first substrate with oscillator circuit and first control circuit mounted thereon, and the Faraday shield, the first case having a first wall and the Faraday shield is positioned between the first wall and the oscillator circuit to shield the oscillator circuit from varying stray capacitance caused by the first wall being deformed by pressure changes inside the ovenized oscillator; h) a second substrate, the second substrate having a first side and a second side, the case of the second temperature controlled oven being mounted on the first side of the second substrate; i) a second control circuit for controlling the temperature of the second temperature controlled oven, the second control circuit being mounted on the second side of the second substrate to be in close thermal contact with the second temperature controlled oven; and j) an oscillator case in which are mounted the second substrate with the second temperature controlled oven and the second control circuit thereon.