Transmitter Circuit High Frequency Amplification
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Solution Overview
Problem
As signal speeds increase, frequency-dependent attenuation in transmission channels leads to unreliable communications due to reduced signal amplitudes, and existing pre-emphasis methods compromise eye height or require high voltage rails.
Innovation Solution
A transmitter circuit with dual paths, where low frequency components are attenuated and high frequency components are amplified, combining these signals to enhance the voltage swing of high frequency components, thereby maintaining signal integrity without reducing eye height or requiring high voltage rails.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pre-emphasis is used to compensate for frequency-dependent attenuation, then signal amplitude is improved at high frequencies, but eye height is reduced
Solution Approach 1:
The transmitter circuit is divided into two separate paths: a first path that passes the signal substantially unchanged, and a second path that applies frequency-dependent amplification. These paths are then combined to produce the output signal. This segmentation allows the patent to add high-frequency content without compromising the overall signal structure and eye height.
Solution Approach 2:
The patent applies different signal processing treatments to different frequency components of the signal. The second path specifically targets and amplifies high-frequency components while leaving low-frequency components unaffected. This local quality approach ensures that only the necessary frequency components are enhanced without affecting other signal characteristics.
2Reliability
If pre-emphasis is used to boost high frequency components, then signal integrity is improved, but high voltage rails are required
Solution Approach 1:
The transmitter is segmented into multiple paths with different functions. The second path contains the frequency-dependent amplifier that boosts high-frequency components, while the first path maintains the original signal. This segmentation allows the use of lower voltage rails in the amplification path since it only needs to boost specific frequency components rather than the entire signal spectrum.
Solution Approach 2:
Instead of amplifying the entire signal with high voltage, the patent applies partial action by only amplifying the high-frequency components that are affected by attenuation. This selective amplification requires less power and lower voltage rails compared to full-signal amplification.
3Productivity
If signal speed is increased to improve communication rate, then productivity is improved, but frequency-dependent attenuation increases causing unreliable communication
Solution Approach 1:
The patent applies frequency-dependent amplification in advance, before the signal is transmitted through the channel. By boosting the high-frequency components at the transmitter side, the signal is pre-compensated for the attenuation that will occur during transmission, ensuring that the signal arrives at the receiver with adequate amplitude even at high communication rates.
Solution Approach 2:
The patent changes the frequency response parameters of the transmitted signal by applying frequency-dependent amplification. This parameter change compensates for the channel's frequency-dependent attenuation characteristics, allowing high-speed communication to proceed reliably by adjusting the signal's spectral distribution before transmission.
Data Source
AI summary
A transmitter may include a first path configured to receive a signal, to attenuate the low frequency components of the signal, and to output the low frequency component attenuated signal. The transmitter may further include a second path configured to receive the signal, to amplify the signal, and to output the amplified signal. The transmitter may also include a node coupled to the first path and the second path and configured such that the low frequency component attenuated signal and the amplified signal combine at the node.