Abstract: A Hybrid feedback Controlled Oscillation Modulator (HCOM) is disclosed, having a 1st feedback path from the output voltage of the switching stage and a second feedback path from the filter output, the two feedback paths being superposed to provide a weighted state feedback signal. The state feedback path signal is subtracted from the input signal to form an error signal, the error signal filtered by a forward path compensation block B(s), closing the loop by feeding the pulse modulator, the loop having a transfer function such that self-oscillation can be established in the closed loop system. In an example embodiment, the first feedback path has a low pass characteristic and the second feedback path lead characteristic, the first feedback path being weighted by a weighting factor ?. Further embodiments include a pure passive realization without a forward path device and the application of 3rd feedback loops to enhance global amplifier performance.

Abstract: A self-oscillating modulator operates at a two-level output. The modulator comprises an alternating output stage (13), an optional output filter (14), a feedback (16) including a function block with a transfer function (MFB), a forward block (12) having a transfer function (MFW) and is provided with means (17) for calculating the difference between the signal originating from said function block and a reference signal. The output voltage of the modulator either from the alternating output stage (13) and/or the output filter (14) is fed back through the function block, and a multiplication element (11) is placed together with the forward block (12) before the alternating output stage (13).

Abstract: A self-oscillating modulator operates at a two-level output. The modulator comprises an alternating output stage (13), an optional output filter (14), a feedback (16) including a function block with a transfer function (MFB), a forward block (12) having a transfer function (MFW) and is provided with means (17) for calculating the difference between the signal originating from said function block and a reference signal. The output voltage of the modulator either from the alternating output stage (13) and/or the output filter (14) is fed back through the function block, and a multiplication element (11) is placed together with the forward block (12) before the alternating output stage (13).