D1, Q3, and Q4 comprise the two-way current mirror. It passively conducts Q2's collector current to C1 via Q3's base-collector when OUT versus C1 is negative, but becomes an active inverting unity-gain current source when OUT goes positive and reverses th
| Authors | Stephen Woodward |
| Main Document | Article «A two-way mirror - current mirror that is» |
| Description | Figure 1 |
| File Format / Size | PDF / 19 Kb |
| Document Language | English |
Other Materials from the Main Document
- Article «A two-way mirror - current mirror that is»
- Figure 1. D1, Q3, and Q4 comprise the two-way current mirror. It passively conducts Q2's collector current to C1 via Q3's base-collector when OUT versus C1 is negative, but becomes an active inverting unity-gain current source when OUT goes positive and reverses th
- Figure 2. When OUT goes low, Q4 is off while Q3 saturates and transmits negative current I to C1. Keep VIN < 1 V so Q2 won't saturate
- Figure 3. With OUT high, the mirror goes active and inverts I into a positive current to charge C1
