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Headphone Amplifier
A general purpose headphone amplifier (HPA) is available in a 140 nm CMOS process. The amplifier can drive loads down to 16 Ω and with a supply voltage ranging from 1.5 Volt to 5 Volt. With the internal feedback resistors the gain of the amplifier is +2 or -1 depending on which input is used.
Block diagram
Features
- Fixed gain of +2 or -1
- Supply voltage 1.5 to 5 V
- Load impedance ≥ 16 Ω
- SNR@5 mW: 101 dB
- THD@5 mW, 1 kHz: 0.03 %
- 0.125 mm2 in 0.14 μm CMOS
Applications
- Cellular Phones / Music Phones
- Smart Phones
- Portable Media / MP3 Players
- Portable CD / DVD Players