Techniques for circuit topologies for combined generator

A method, comprising:

• receiving, by a surgical instrument, a combined signal comprising a radio frequency (RF) component and an ultrasonic component, from a generator;
• receiving, by the surgical instrument, a first input indicating a user selection to configured the surgical instrument, the surgical instrument comprising a radio frequency (RF) energy output, an ultrasound energy output, and a circuit configured to steer the RF component to the RF energy output and steer the ultrasonic component to the ultrasonic energy output;
• receiving, by the surgical instrument, a second input indicating a measure of electrical impedance at the RF energy output, wherein the measure of electrical impedance indicates tissue with staples, tissue without staples, or an open circuit condition;
• measuring a frequency response of a circuit component of the circuit;
• and
• adjusting a frequency of the RF component based on the frequency response of the circuit component, the first input and the second input.

A method, comprising:

• receiving, by a surgical instrument, a first input indicating a user selection of a first option or a second option, the surgical instrument comprising a radio frequency (RF) energy output, an ultrasonic energy output, and a first jaw and a second jaw configured for pivotal movement between a closed position and an open position;
• receiving, by the surgical instrument, a second input indicating whether the first jaw and the second jaw are in the closed position or in the open position;
• receiving, by the surgical instrument, a third input indicating electrical impedance at the RF energy output, wherein the electrical impedance indicates a tissue with staples, the tissue without staples or an open circuit condition;
• selecting, by the surgical instrument, a first mode or a second mode of treating the tissue based on the first input, the second input, and the third input, wherein:
• the first mode comprises applying RF energy to the tissue, wherein the RF energy is filtered from a combined signal comprising a RF component and an ultrasonic component;
• and
• the second mode comprises applying ultrasonic energy to the tissue, wherein the ultrasonic energy is filtered from the combined signal;
• and
• selecting, by the surgical instrument, a level of RF energy or ultrasonic energy applied to the tissue based on the first input, second input, and the third input.