This paper presents the design of a low-voltage high-frequency operational amplifier implemented in bipolar technology. The minimum power supply voltage for this amplifier can be as low as 0.9 V, so it is suitable for portable equipment applications. The design emphasis is on the high frequency response. A pole-zero cancellation compensation technique and a special low-voltage design gives a simulated cutoff frequency of about 175 MHz with a 50° phase margin at a power supply voltage of ±0.5 V with a 10 kΩ load resistance; the low-frequency voltage gain is 110 dB. The common-mode input range includes, and can exceed, the negative supply voltage by about 400 mV. A complimentary class-B type output stage enables the output voltage to reach both supply rails within about 100 mV without significant signal distortion. This amplifier dissipates 875 μW.