Piezoelectric audio amplifier
Encyclopedia
A piezoelectric audio amplifier (PAA) is a single integrated circuit or a PCB developed to amplify small audio signals to drive piezoelectric audio loudspeaker
elements. A piezo audio amplifier can amplify a small signal sine wave of 1 volt peak-to-peak to a signal of about 30 or 60 volts.
The main impedance of the piezo speaker or piezo vibration element is a capacitance with values between 10nF and 1uF.
1) A DC-DC converter that creates a specific voltage level for the end amplifier
2) Audio Amplifier
Topology: class AB, class D
, Class G,….topology for amplifying a small signal. The Maximum voltage level is created by the DC-DC converter.
configuration is common used.
An audio signal of 60 volt peak-to-peak (Vpp) can be created with a DC voltage of 30V.
Creating a voltage level of 30Vdc instead of 60Vdc is easier done with a DC-DC converter.
The piezoelectric speaker is between two amplifiers. The left side will see a 30Vpp signal while on the right the same signal of 30Vpp will appear reversed (180°phase shifted).
With this technique the piezo speaker will see a total audio signal of 60Vpp.
e.g PAA-StepUpBTL-01
Loudspeaker
A loudspeaker is an electroacoustic transducer that produces sound in response to an electrical audio signal input. Non-electrical loudspeakers were developed as accessories to telephone systems, but electronic amplification by vacuum tube made loudspeakers more generally useful...
elements. A piezo audio amplifier can amplify a small signal sine wave of 1 volt peak-to-peak to a signal of about 30 or 60 volts.
Characteristics
- Max Vpp: Maximum voltage peak to peak that the amplifier can deliver at his output channel.
- Max Cap: Maximum capacitance that the Piezo Audio Amplifier can handle.
The main impedance of the piezo speaker or piezo vibration element is a capacitance with values between 10nF and 1uF.
Basic topology
The construction of a piezo audio amplifier consists out of two basic electronic concepts.1) A DC-DC converter that creates a specific voltage level for the end amplifier
2) Audio Amplifier
Audio amplifier
An audio amplifier is an electronic amplifier that amplifies low-power audio signals to a level suitable for driving loudspeakers and is the final stage in a typical audio playback chain.The preceding stages in such a chain are low power audio amplifiers which perform tasks like pre-amplification,...
Topology: class AB, class D
Switching amplifier
A class-D amplifier or switching amplifier is an electronic amplifier where all power devices are operated as binary switches. They are either fully on or fully off. Ideally, zero time is spent transitioning between those two states....
, Class G,….topology for amplifying a small signal. The Maximum voltage level is created by the DC-DC converter.
Common technique
To avoid high voltage levels the Bridge-Tied LoadBridge-tied load
A bridge-tied load , also known as bridged transformerless and bridged mono, is an output configuration for audio amplifiers, a form of impedance bridging used mainly in professional audio applications. The two channels of a stereo amplifier are fed the same monaural audio signal, with one...
configuration is common used.
An audio signal of 60 volt peak-to-peak (Vpp) can be created with a DC voltage of 30V.
Creating a voltage level of 30Vdc instead of 60Vdc is easier done with a DC-DC converter.
The piezoelectric speaker is between two amplifiers. The left side will see a 30Vpp signal while on the right the same signal of 30Vpp will appear reversed (180°phase shifted).
With this technique the piezo speaker will see a total audio signal of 60Vpp.
e.g PAA-StepUpBTL-01