Circuits and methods for adjusting one or more operation parameters of a semiconductor device. One example of a circuit includes a first semiconductor device, a beta sensing circuit coupled to the first semiconductor device and configured to measure a current gain of the first semiconductor device and generate a first control signal based on a value of the current gain of the first semiconductor device, and a reference control circuit coupled to the beta sensing circuit and configured to receive the first control signal and adjust an operation parameter of the first semiconductor device based on the value of the current gain of the first semiconductor device.