I need to design an analog circuit with the following caractaristics:
1) Input voltage: V, variable.
2) When V>0, a capacitor charges until it reaches a maximum.
3) When V<0, the capacitor discharges, until it reaches a minimum.
4) When V=0, the capacitor charge remains unchanged.
5) it should be as simple as possible, use only discrete components (or 741 op amp).
6) it doesn't need to be very precise, but when V=0 the capacitor must not change!
7) the capacitor is about 1uF, not electrolytic.
I thought of using a voltage controlled current source for this, but every current source I use has too high gain (greater than 1 mA/V). Anyone could help me?
1) Input voltage: V, variable.
2) When V>0, a capacitor charges until it reaches a maximum.
3) When V<0, the capacitor discharges, until it reaches a minimum.
4) When V=0, the capacitor charge remains unchanged.
5) it should be as simple as possible, use only discrete components (or 741 op amp).
6) it doesn't need to be very precise, but when V=0 the capacitor must not change!
7) the capacitor is about 1uF, not electrolytic.
I thought of using a voltage controlled current source for this, but every current source I use has too high gain (greater than 1 mA/V). Anyone could help me?