FIG. 9 shows a sine to triangle wave converter circuit. Field Effect Transistors U1A, U1B, U1C, and U1D are similarly connected as described for FIG. 8. The source terminals of U1A and U1D are coupled together and further coupled to a current source IBiasQ1 denoted by ICQ1. The source terminals of U1B and U1C are coupled together and further coupled to a current source IBiasQ2 denoted by ICQ2. Sine wave to triangle wave conversion is provided by coupling a sine wave signal for Vin1 and having unequal currents for IBiasQ1 and IBiasQ (e.g., ICQ1≠ICQ2 or IBiasQ1≠IBiasQ2). An output signal is provided via Vout or Vout\.
Alternatively in FIG. 9, two resistors may be substituted for current sources IBiasQ1 and IBiasQ2 to provide sine wave to triangle wave conversion. Preferably the current flowing through these two resistors is not equal. In FIG. 9, the FETs U1A, U1B, U1C, and U1D may be substituted with depletion mode devices, or bipolar transistors with series emitter resistors (e.g., series emitter degeneration resistors).
Note that the circuits in FIG. 8 and FIG. 9 are not the same as a triangle wave to sine wave converter, where the input signal is a triangle wave (e.g., instead of a sine wave signal) and the output signal is a sine wave (e.g., instead of a triangle waveform).
