A crystal amplifier for driving a crystal to oscillate at a resonant frequency including a current source, an amplifier, and at least one degeneration resistor. The amplifier has an input coupled to an amplifier input node and has an amplifier output current path coupled the amplifier output node. Each degeneration resistor is coupled in series with the amplifier output current path. The current source provides a core bias current through the amplifier output current path and through each degeneration resistor to a reference node. The resistance of each degeneration resistor may be selected to minimize a frequency shift over an operating temperature range while maintaining at least one operating parameter within predetermined operating limits, or can be selected based on a crystal type. Each degeneration resistor may be fixed or adjustable.