Glitch reduction technique for switched amplifiers having selectable transfer gain

A method of changing a dynamic range of a signal source, the method comprising:

• providing a first signal gain to a primary input signal to provide a first gained signal at an output of the signal source;
• providing a second signal gain to the primary input signal to generate a second gained signal;
• providing an auxiliary signal gain to an auxiliary input signal to generate a gained auxiliary signal, wherein the auxiliary signal gain is equal to a difference between the first signal gain and the second signal gain;
• setting the auxiliary input signal equal to the primary input signal;
• and
• changing to providing a sum of the second gained signal and gained auxiliary signal at the output of the signal source.

An electronic system, the system comprising:

• a primary gain circuit path configured to provide a first signal gain;
• an auxiliary gain circuit path configured to provide a second signal gain;
• a summing circuit configured to generate a summed signal of a sum of a signal of the primary gain circuit path and a signal of the auxiliary gain circuit path and provide the summed signal as an output signal;
• a feedback circuit path connected to an output of the system, and configured to adjust the signal of the primary gain circuit path to reduce a difference between the output signal and a target signal;
• and
• logic circuitry configured to selectively set the signal of the auxiliary gain circuit path to an auxiliary signal or equal to the signal of the primary gain circuit path.