Digitally Controlled And Tuned Crystal Oven

"Evaluation modules, each containing DIL-14 OCXO, with tuning/ monitoring software
may be purchased for US$495/-"

Conventional crystal oven

Ø      Difficult to match oven’s set point to crystal turn point

Ø      Analog components need regulated internal supply (regulator adds an uncontrolled hotspot in the oven)

Ø      Varactor diode bias potentiometer for frequency tuning is time consuming. Setting may be affected by aging and shock.

Ø      Component aging effects PID controller

Microprocessor controlled crystal oven

Ø      Uses 8-pin SOIC low-cost micro-controller with internal EEPROM that retains:

-        Temperature set-point

-        Frequency tuning (digital potentiometer changes varactor diode bias)

Ø      Digital temperature sensor

Ø      Digital PID controller with feed-forward to suppress oscillations around set-point

Ø      Uses unregulated power for digital electronics/ heater (minimize uncontrolled heat dissipation)

-        PWM sensing of supply voltage

-        Digital compensation for voltage variations in heater PWM computation

Microprocessor controlled crystal oven simplifies calibration

Ø      Optically isolated serial interface board for half-duplex communication to a PC

Ø      Simple protocol that allows:

-        Monitoring oven temperature

-        Setting oven temperature

-        Frequency tuning

Ø      Interactive GUI exercises protocol at operator’s behest

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