As can be seen, at the beginning, the offset cancellation circuit
is interim and setting the output of the DCCs and after this transition time the output signal is reliable.
In this paper, we presented the design and testing for an unprecedented ALE heart sound cancellation circuit
developed on the FPGA DE2-70 education board for electronic stethoscopes.
An integrated dark current cancellation circuit
enables accurate sensing below 0.01 lux.
A specular reflection cancellation circuit
operates in conjunction with AGC logic to eliminate reading errors caused by highly reflective backgrounds.
The feedforward linearizer consists of two fundamental circuits -- the signal cancellation circuit
and the error cancellation circuit
Figure 3 shows a detailed view of the readout channel, which includes a dark current cancellation circuit
, switched-capacitor integrator, and sample-and-hold circuit.
The ICMs include a magnetic component similar to Pulse's discrete Starmagnetic[TM] component H1260, and it has an optional resistor capacitor noise cancellation circuit
with alternative shield configurations for improving system compliance to worldwide EMC standards.
Feed-forward linearization really utilizes two circuits: an input signal cancellation circuit
and a distortion (or error) cancellation circuit
TABLE I PERFORMANCE OF THE MIXERS AND THEIR 0[degrees] + 180[degrees] SECOND-ORDER CANCELLATION CIRCUIT
IF input (MHz) 869 to 895 LO input (MHz) 1060 to 1100 RF output (MHz) 1930 to 1990 Single-mixer LO drive (dBm) 18 Second-order cancellation (dBm) 21 Mixer 1 Mixer 2 Cancellation Circuit
Conversion loss (dB) 7.5 7.6 8.5 Input [IP.sub.3] (dBm) 38 37 42 P1dB (dBm) 23 23 27 L-R isolation (dB) 26 27 52 L-I isolation (dB) 30 30 40
For example, one can implement the above self-interference cancellation idea completely in analog domain using noise cancellation circuits
reported by Radunovic et al.
A voice network can be retrofitted with echo cancellation circuits
, but these require expensive and difficult infrastructure modifications, which increase the cost of implementing an ATM network.