CN205005038U - Amplitude of oscillation adjustable SST type data transmitter with pre -emphasis is balanced - Google Patents
Amplitude of oscillation adjustable SST type data transmitter with pre -emphasis is balanced Download PDFInfo
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- CN205005038U CN205005038U CN201520822928.8U CN201520822928U CN205005038U CN 205005038 U CN205005038 U CN 205005038U CN 201520822928 U CN201520822928 U CN 201520822928U CN 205005038 U CN205005038 U CN 205005038U
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Abstract
The utility model discloses an amplitude of oscillation adjustable SST type data transmitter with pre -emphasis is balanced distributes to the SST unit when anteposition signal and preemphasized signal, through the realization of parallel resistance between difference output end low frequency signals's output, has overcome the defect that there is great waste in existing SST type data transmitter energy when sending low frequency signals of taking the pre -emphasis equilibrium, has improved the efficiency of sending the ware greatly, under higher pre -emphasis intensity, the utility model discloses save consumption at least 50%. The utility model discloses amplitude of oscillation adjustment can realize exporting for same data transmitter can be applied to the transmission medium of different losses, has further improved energy efficiency. The utility model discloses a SST type transmitting circuit who comprises a plurality of the same units and one is drive circuit in advance, and wherein drive circuit comprises logic modules and function selection module again in advance. The utility model discloses in can be used to various data communication system, especially can embody high -effect characteristics in high -speed data communication.
Description
Technical field
The utility model belongs to the technical field of data communication high-speed interconnect integrated circuit, it is a kind of amplitude of oscillation with preemphasis equilibrium adjustable SST type data transmitter, can according to the amplitude of oscillation of the loss size adjustment output signal of channel, and provide the preemphasis mode of low-power consumption, can effectively compensated high-speed data communication because of the signal attenuation that brings of channel width deficiency, can be used for, in various data communication transmitter or transceiver system, also using as independent IP.
Background technology
Fig. 1 is a kind of typical high-speed data communication system, and this system is formed primarily of transmitter 100, transmission medium 105, AC coupled 106a (or direct-current coupling 106b), receiver 108.Transmitting-receiving and the transport process of data are as follows: differential digital signal 109 is driven by transmitter 100, and by the transmission of transmission medium 105, signal arrives receiving terminal and received by receiver 108 and revert to differential digital signal 110.For reducing the reflection of signal, usually can be configured for terminating resistor 107a and 107b of matching transmission media channel impedance at transmitting terminal, receiving terminal or two ends simultaneously.The bias potential V of described receiver end connecting resistance 107a and 107b
rXfixed potential or unsettled can be received when direct-current coupling, but must fixed potential be connect when AC coupled.Transmission medium 105 can include but not limited to one or more combination following: chip package, printed circuit board, backboard, connector, various types of cables etc.
Along with the quick raising of data signaling rate, several GHz (GHz) or tens GHzs are reached at present, the channel width of transmission medium 105 is significantly less than message transmission rate, the decay based on signal frequency caused thus can make data integrity be badly damaged, and the error rate improves greatly.For compensating the signal attenuation in transmission medium 105, preemphasis balancing technique is adopted to carry out preliminary treatment to it before signal enters transmission medium 105, output difference sub-signal 111, namely improves its output amplitude 114 for the radio-frequency component in signal, and reduces output amplitude 113 for low-frequency component.Signal is through the transmission of transmission medium 105, and the decay of its radio-frequency component is greater than low-frequency component, and when signal arrives receiving terminal, the amplitude of low-and high-frequency composition reaches unanimity, and reaches balanced, forms the differential input signal 112 of receiving terminal.
Transmitter 100 is a kind of n+1 tap power sources in series resistance (sourceseriesterminated, SST) type data transmitters with preemphasis equilibrium.Data-signal 109 produces the data-signal of two-way or the delay of multichannel difference through delay control circuit 103, and signal is sent to predriving stage 102.After predriving stage 102 pairs of signals process, drive multiple branches such as transtation mission circuit 101a, 101b, 101c, actual tap number can be configured according to the performance of transmission medium.Transtation mission circuit 101a structure as shown in Figure 2, is the SST type structure of classics.Each branches such as transtation mission circuit 101a, 101b, 101c at output 104a and 104b short circuit, driver output differential signal 111.
There is two problems in the SST type data transmitter 100 of described band preemphasis equilibrium.First problem is the supply power voltage V that the amplitude of oscillation exported is fixed as transtation mission circuit
sST.For the transmission medium that loss is large, large output voltage swing can effectively reduce the error rate of signal; But for the transmission medium that loss is little, waste energy consumption, reduce energy efficiency.Second Problem is the energy that can power supply be utilized more fully to supply when the radio-frequency component outputed signal, and efficiency is very high; But when the low-frequency component outputed signal, but waste a large amount of energy consumptions, efficiency is lower, and along with the raising of preemphasis intensity, efficiency declines fast, seriously limits SST type data transmitter Circnit Layout preemphasis balanced to compensate the ability of transmission medium channel width deficiency.This two problems hinders this structure in data communication, particularly the extensive use in high-speed data communication field.
Utility model content
The utility model, for being with the defect that the SST type transmitter usefulness of preemphasis equilibrium is lower, proposes a kind of amplitude of oscillation with preemphasis equilibrium adjustable SST type data transmitter.
Here describe its structure for two tap SST type transmitters, the circuit structure of many taps SST type transmitter can simply be expanded based on this.As shown in Figure 3, described transmitter is made up of predrive circuit 102 and SST type transtation mission circuit.SST type transtation mission circuit is made by N number of identical SST unit such as 101a, 101b, 101c.Predriving stage is made up of two parts: logic module 201 and function selecting module.Function selecting module is made up of N number of identical unit such as 202a, 202b, 202c, and each unit of function selecting module is made up of 6 MUX (multiplexer) 203,204,205,206,207,208.
Described SST type transtation mission circuit is made up of multiple identical SST unit.Each SST unit is made up of three PMOS transistor (PM1, PM2, PM3), three nmos pass transistors (NM1, NM2, NM3) and two resistance (R1, R2).
Annexation for a kth SST unit is as follows:
1) source electrode of PM1 connects power supply; PM1 drain electrode is connected with resistance R1 with the drain electrode of NM1, resistance R3; The grid of PM1 is connected with the output of the 1st multiplexer 203 of a kth function selecting module unit;
2) source ground of NM1; NM1 drain electrode is connected with resistance R1 with the drain electrode of PM1, resistance R3; The grid of NM1 is connected with the output of the 2nd multiplexer 204 of a kth function selecting module unit;
3) source electrode of NM3 is connected with resistance R4 with the source electrode of PM3; The drain electrode of NM3 is connected with resistance R3 with the drain electrode of PM3; The grid of NM3 is connected with the output of the 3rd multiplexer 205 of a kth function selecting module unit;
4) source electrode of PM3 is connected with resistance R4 with the source electrode of NM3; The drain electrode of PM3 is connected with resistance R3 with the drain electrode of NM3; The grid of NM3 is connected with the output of the 4th multiplexer 206 of a kth function selecting module unit;
5) source electrode of PM2 connects power supply; PM2 drain electrode is connected with resistance R2 with the drain electrode of NM2, resistance R4; The grid of PM2 is connected with the output of the 5th multiplexer 207 of a kth function selecting module unit;
6) source ground of NM2; NM2 drain electrode is connected with resistance R2 with the drain electrode of PM2, resistance R4; The grid of NM2 is connected with the output of the 6th multiplexer 208 of a kth function selecting module unit;
7) drain electrode of R1 one end and PM1, the drain electrode of NM1, R3 are connected; The other end of R1 is connected with the output 104a of transmitter;
8) drain electrode of R2 one end and PM2, the drain electrode of NM2, R4 are connected; The other end of R2 is connected with the output 104b of transmitter;
9) R3 one end is connected with resistance R1 with the drain electrode of PM1, the drain electrode of NM1; The other end of R3 is connected with the drain electrode of NM3 with the drain electrode of PM3;
10) R4 one end is connected with resistance R2 with the drain electrode of PM2, the drain electrode of NM2; The other end of R4 is connected with the source electrode of NM3 with the source electrode of PM3.
Described logic module 201 is made up of 8 modules (8 gates 209 ~ 216).The input signal of logic module is the signal D [n] of two-pass DINSAR,
d [n+1],
the structure of 209 ~ 216 is identical, is all made up of 4 PMOS transistor and 4 nmos pass transistors, and difference is that the input signal of each transistor in different units is different.
As shown in Figure 4, the connection of 8 transistors is described for 216:
1) source electrode of PM4 connects power supply; The drain electrode of PM4 is connected with the source electrode of PM5; The grid of PM4 and input signal
be connected;
2) source electrode of PM5 is connected with the drain electrode of PM4; The drain electrode of PM5 is connected with output with the drain electrode of the drain electrode of NM4, NM6, the drain electrode of PM7; The grid of PM5 with
be connected;
3) source electrode of PM6 connects power supply; The drain electrode of PM6 is connected with the source electrode of PM7; The grounded-grid of PM6;
4) source electrode of PM7 is connected with the drain electrode of PM6; The drain electrode of PM7 is connected with output with the drain electrode of the drain electrode of NM4, NM6, the drain electrode of PM5; The grid of PM7 is connected with D [n];
5) source electrode of NM4 is connected with the drain electrode of NM5; The drain electrode of NM4 is connected with output with the drain electrode of the drain electrode of PM5, PM7, the drain electrode of NM6; The grid of NM4 is connected with D [n];
6) source ground of NM5; The drain electrode of NM5 is connected with the source electrode of NM4; The grid of NM5 with
be connected;
7) source electrode of NM6 is connected with the drain electrode of NM7; The drain electrode of NM6 is connected with output with the drain electrode of the drain electrode of PM5, PM7, the drain electrode of NM4; The grounded-grid of NM6;
8) source ground of NM7; The drain electrode of NM7 is connected with the source electrode of NM6; The grounded-grid of NM7.
Described function selecting module is made up of N number of identical unit 202a, 202b, 202c etc.202a is made up of the multiplexer (203 ~ 208) that 6 structures are identical again.203 ~ 208 are all made up of 5 PMOS transistor and 5 nmos pass transistors, and difference is that the grid input signal of the transistor of different units is different.
As shown in Figure 5, the connection of 10 transistors is described for 208:
1) source electrode of PM8 connects power supply; The drain electrode of PM8 is connected with the source electrode of PM9; The grid connection control signal EN3 of PM8;
2) source electrode of PM9 is connected with the drain electrode of PM8; The drain electrode of the drain electrode of PM9 and the drain electrode of NM8, PM11, the drain electrode of NM10, the drain electrode of PM12, the drain electrode of NM12 are connected with output; The grid of PM9 with in logic module 216 output be connected;
3) source electrode of PM10 connects power supply; The drain electrode of PM10 is connected with the source electrode of PM11; The grid connection control signal of PM10
4) source electrode of PM11 is connected with the drain electrode of PM10; The drain electrode of the drain electrode of PM11 and the drain electrode of NM8, PM9, the drain electrode of NM10, the drain electrode of PM12, the drain electrode of NM12 are connected with output; The grid of PM11 with in logic module 215 output be connected;
5) source electrode of PM12 connects power supply; The drain electrode of the drain electrode of PM12 and the drain electrode of NM8, PM9, the drain electrode of NM10, the drain electrode of PM11, the drain electrode of NM12 are connected with output; The grid of PM12 connects power supply;
6) source electrode of NM8 is connected with the drain electrode of NM9; The drain electrode of the drain electrode of NM8 and the drain electrode of PM9, PM11, the drain electrode of NM10, the drain electrode of PM12, the drain electrode of NM12 are connected with output; The grid of NM8 with in logic module 216 output be connected;
7) source ground of NM9; The drain electrode of NM9 is connected with the source electrode of NM8; The grid connection control signal EN3 of NM9;
8) source electrode of NM10 is connected with the drain electrode of NM11; The drain electrode of the drain electrode of NM10 and the drain electrode of PM9, PM11, the drain electrode of NM8, the drain electrode of PM12, the drain electrode of NM12 are connected with output; The grid of NM10 with in logic module 215 output be connected;
9) source ground of NM11; The drain electrode of NM11 is connected with the source electrode of NM10; The grid connection control signal EN2 of NM11;
10) source ground of NM12; The drain electrode of the drain electrode of NM12 and the drain electrode of NM8, PM9, the drain electrode of NM10, the drain electrode of PM11, the drain electrode of PM12 are connected with output; The grid connection control signal of NM12
11) EN2 and EN3 meets: EN2=CONFIG0CONFIG1, EN3=CONFIG0CONFIG1; CONFIG1 and CONFIG2 is the control signal being input to 202a.
Compared with prior art, the beneficial effects of the utility model are as follows:
The utility model provides the amplitude of oscillation adjustable SST type data transmitter with preemphasis equilibrium, SST unit is distributed to present bit signal and preemphasized signal, the output of low frequency signal is realized by parallel resistance between difference output end, there is the defect of larger waste in the SST type data transmitter energy when sending low frequency signal overcoming the equilibrium of existing band preemphasis, substantially increase the usefulness of transmitter, under higher preemphasis intensity, the utility model saves power consumption at least 50%.The SST data transmitter that the utility model proposes can realize output voltage swing adjustment, and the same data transmitter enable is applied to the transmission medium of different loss, further increases energy efficiency.The utility model can be used for, in various data communication system, particularly embodying dynamical feature in high-speed data communication.
Accompanying drawing explanation
Fig. 1 is typical high-speed data communication system schematic diagram.
Fig. 2 is the SST type transtation mission circuit of existing band preemphasis equilibrium.
Fig. 3 is the adjustable two tap SST type transmitter architecture figure of the amplitude of oscillation of the band preemphasis equilibrium that the utility model proposes.
Fig. 4 is the structure chart of the logical block 216 used in the adjustable two tap SST type transmitters of the amplitude of oscillation of the band preemphasis equilibrium that the utility model proposes.
Fig. 5 is the structure chart of the multiplexer 208 used in the adjustable two tap SST type transmitters of the amplitude of oscillation of the band preemphasis equilibrium that the utility model proposes.
Fig. 6 is the equivalent electric circuit when carrying out preemphasis adjustment of the SST type transmitter of existing band preemphasis equilibrium, and (a) is circuit when exporting radio-frequency component, and (b) is circuit during output low frequency.
Fig. 7 is the signal output waveform of two tap SST type transmitters of band preemphasis equilibrium.
Fig. 8 is the equivalent electric circuits of the adjustable two tap SST type transmitters of the amplitude of oscillation of the band preemphasis equilibrium that the utility model proposes when carrying out amplitude of oscillation adjustment.
Fig. 9 is the equivalent electric circuits of the adjustable two tap SST type transmitters of the amplitude of oscillation of the band preemphasis equilibrium that the utility model proposes when carrying out preemphasis adjustment, a (), for exporting circuit during radio-frequency component, (b) is circuit during output low frequency.
Figure 10 is the adjustable power consumption of two tap SST type transmitters consumption of the amplitude of oscillation of the band preemphasis equilibrium that the utility model proposes and the relation of the amplitude of oscillation.
Figure 11 is the SST type transmitter and the power consumption ratio of existing SST type transmitter under different preemphasis intensity that the utility model proposes.
Embodiment
For enabling above-mentioned purpose of the present utility model, feature and advantage become apparent more, below by specific embodiments and the drawings, are described further the utility model.
Fig. 2 is the typical structure of the SST type data transmit circuit of existing band preemphasis equilibrium, is made up of N number of identical SST unit.During transtation mission circuit work, output resistance must mate with the characteristic impedance of transmission medium 105.The conducting resistance of the conducting resistance of PM1 and the conducting resistance of NM1, PM2, the conducting resistance of NM2 are equal.When 101a is in disable state, PM1, PM2, NM1 and NM2 turn off, and the output impedance of 101a is infinitely great.The mode of impedance matching is that the number by controlling enable unit makes output resistance equal with transmission medium 105.
Existing SST data transmitter preemphasis implementation be that unit is distributed to different taps.For the SST data transmitter of two taps, total total N number of identical SST unit, wherein M unit is enable, and M is less than or equal to N.Such as in order to realize 3dB preemphasis, need 3M/4 unit to distribute to data D [n], M/4 unit distribute to D [n] postpone a unit interval after data D [n+1].In+ by 3M/4 unit connects D [n], and In-connects
the In+ of M/4 unit connects D [n+1], and In-connects
Fig. 6 is the equivalent electric circuit of data transmitter, wherein R
mainfor distributing to the equivalent resistance of the unit of D [n], R
postfor distributing to the equivalent resistance of the unit of D [n+1], R
tfor the equivalent resistance of transmission medium 105.When D [n] is identical with D [n+1], the equivalent electric circuit of transmitter is as shown in Fig. 6 (a), and output voltage is V
h(114 states as in Fig. 7); As D [n]=-D [n+1], the equivalent electric circuit of transmitter is as shown in Fig. 6 (b), and output voltage is V
l(113 states as in Fig. 7).The intensity of definition preemphasis
during the state 114 of being in, the total power consumption of transmitter consumption is
wherein
for the situation of impedance matching, 2R=R
t,
during the state 113 of being in, the total power consumption of transmitter consumption is
Definition transition density (TransitionDensity, the data bit that present bit is not identical with last position accounts for the percentage of whole data volume) is D, the gross power that transmitter consumes
Existing SST data transmitter cannot carry out amplitude of oscillation adjustment, and single-ended output voltage swing is fixed as
Fig. 3 is the adjustable two tap SST type transmitter architecture figure of the amplitude of oscillation of the band preemphasis equilibrium that the utility model proposes.SST type transtation mission circuit is made up of N number of identical unit; Predrive circuit is made up of logic module and function selecting module.Function selecting module is made up of N number of identical unit again, the N number of unit one_to_one corresponding in they and SST type transtation mission circuit.Each unit in function selecting module is controlled by the control word of 2 bits.When control word is 00, the corresponding unit in SST transtation mission circuit is in disable state, and output resistance is infinitely great.When control word is 01, the corresponding unit in SST transtation mission circuit is in amplitude of oscillation adjustment state, and the unit being in this state is more, and output voltage swing is less.When control word is 10, the transmission of corresponding unit in SST transtation mission circuit be D [n] and
when control word is 11, the signal of the corresponding unit transmission in SST transtation mission circuit is correlated with D [n+1] with D [n]: when D [n] is identical with D [n+1], the signal of transmission is D [n]; When D [n] is different from D [n+1], output amplitude reduces, thus realizes preemphasis.
When transtation mission circuit described in Fig. 3 works, output resistance must mate with transmission medium, and the mode of coupling selects module by controlling functions.Adjustment is in the number of the unit of disable state, just can control the output impedance of transtation mission circuit.Suppose that the output resistance of each unit in SST transtation mission circuit is R
sST, then have M unit to be in disable state (namely having the control word of M unit not to be 00 in function selecting module), the output resistance of transmitter is
during impedance matching, meet
An innovative point of the present utility model is that described in Fig. 3, SST type data transmitter can provide adjustable output voltage swing.The amplitude of oscillation that the utility model can export according to the loss adjustment of transmission medium: for the transmission medium of high loss, use large output voltage swing; For low-loss transmission medium, use little output voltage swing, thus improve energy efficiency.In function selecting module, in the individual enable unit of M, the control word of S unit unit is had to be 01.As shown in Figure 8, wherein the parallel impedance of S SST unit is R to equivalent electric circuit
2, the parallel impedance of (M-S) individual SST unit is R
1.The Single-end output amplitude of oscillation is
power consumption is
wherein
therefore, when S increases, output voltage swing reduces, and the power consumption of consumption also reduces.
An innovative point of the present utility model be SST type data transmitter described in Fig. 3 when realizing identical preemphasis, consume lower power consumption.For realizing preemphasis intensity
consider the situation of S=0, then only need (1-A in M unit
-1) the corresponding control word of M unit is set to 11, A
-1m the corresponding control word of unit is set to 10.Equivalent electric circuit as shown in Figure 9, wherein R
mainfor A
-1the parallel impedance of M each SST unit of unit, R
postfor (1-A
-1) parallel impedance of a M SST unit.Fig. 9 (a) is
(114 states in Fig. 7), Fig. 9 (b) is
(in Fig. 7 113 states).For transition density D, the gross power that transmitter consumes
Therefore the SST data transmitter that the SST data transmitter power dissipation ratio of Fig. 3 proposition is existing has higher energy efficiency.
Adopt the widely used PRBS pseudo-random binary sequence of assessment data communication system performance, the transition density D of PRBS is 0.5, and the power consumption that can obtain the voltage of the utility model shown in Figure 10 transmitter exports the relation of the single-ended amplitude of oscillation.Can see, power consumption reduces rapidly with the reduction of output voltage swing.Figure 11 is the utility model voltage transmitter and the power consumption ratio of existing SST type transmitter under different preemphasis intensity, and when larger preemphasis intensity A, the utility model can save the power consumption more than 50%, shows dynamical feature.
Above embodiment is only in order to illustrate the technical solution of the utility model but not to be limited; those of ordinary skill in the art can modify to the technical solution of the utility model or equivalent replacement; and not departing from spirit and scope of the present utility model, protection range of the present utility model should be as the criterion with described in claims.
Claims (5)
1. with a amplitude of oscillation adjustable SST type data transmitter for preemphasis equilibrium, it is characterized in that: comprise a SST type transtation mission circuit and a predrive circuit; Described SST type transtation mission circuit comprises multiple identical unit, and each unit comprises three PMOS transistor PM1, PM2 and PM3, three nmos pass transistors NM1, NM2 and NM3, and two resistance R1, R2; Described predrive circuit comprises logic module and function selecting module, described logic module comprises 8 gates, described function selecting module comprises multiple identical unit, unit number is identical with unit number in SST type transtation mission circuit, and with the unit one_to_one corresponding in SST type transtation mission circuit, each unit of described function selecting module comprises 6 multiplexers;
In described SST type transtation mission circuit, the source electrode of the PM1 in a kth SST unit connects power supply, drains to be connected with resistance R1 with the drain electrode of NM1, resistance R3, and grid is connected with the 1st multiplexer output of a kth function selecting module unit; The source ground of the NM1 in a kth SST unit, grid is connected with the 2nd multiplexer output of a kth function selecting module unit; The grid of the NM3 in a kth SST unit is connected with the 3rd multiplexer output of a kth function selecting module unit; The grid of the PM3 in a kth SST unit is connected with the 4th multiplexer output of a kth function selecting module unit; The source electrode of the PM2 in a kth SST unit connects power supply, drains to be connected with resistance R2 with the drain electrode of NM2, resistance R4, and grid is connected with the 5th multiplexer output of a kth function selecting module unit; The source ground of the NM2 in a kth SST unit, grid is connected with the output of the 6th multiplexer of a kth function selecting module unit; The drain electrode of the R1 one end in a kth SST unit and PM1, the drain electrode of NM1, resistance R3 are connected, and the other end of R1 is connected with the output 104a of transmitter; The drain electrode of the R2 one end in a kth SST unit and PM2, the drain electrode of NM2, R4 are connected, and the other end of R2 is connected with the output 104b of transmitter; R3 one end in a kth SST unit is connected with resistance R1 with the drain electrode of PM1, the drain electrode of NM1, and the other end of R3 is connected with the drain electrode of NM3 with the drain electrode of PM3; R4 one end in a kth SST unit is connected with resistance R2 with the drain electrode of PM2, the drain electrode of NM2, and the other end of R4 is connected with the source electrode of NM3 with the source electrode of PM3.
2. the amplitude of oscillation with preemphasis equilibrium according to claim 1 adjustable SST type data transmitter, it is characterized in that, in each SST unit in described SST transtation mission circuit, between the drain electrode of PM1 and NM1, there is a switch be made up of R3, R4, NM3 and PM3; When the control word of the unit of the kth in function selecting module is 01, transistor NM3 and PM3 of a corresponding kth SST unit opens all the time and transistor PM1, PM2, NM1 and NM2 turn off, and the output voltage swing of described data transmitter reduces.
3. the amplitude of oscillation with preemphasis equilibrium according to claim 1 adjustable SST type data transmitter, it is characterized in that, the output voltage swing of described SST type data transmitter is proportional to (M-S), wherein M is the number of enable SST unit, S is that in function selecting module, Input Control Word is the number of the unit of 01, and the size of adjustment S can change the amplitude of oscillation.
4. the amplitude of oscillation with preemphasis equilibrium according to claim 1 adjustable SST type data transmitter, it is characterized in that, when a kth unit input control for described function selecting module is 11, a kth SST unit corresponding in SST type transtation mission circuit is in preemphasis state: when data D [n] is identical with the data D [n+1] postponing a data break, switch NM3 and PM3 in a kth SST unit turns off, grid input D [n] of PM1 and NM1, the grid of PM2 and NM2 inputs the non-of D [n], and output amplitude is large; When D [n] is different from D [n+1], kth SST unit breaker in middle NM3 and PM3 opens, and PM1, PM2, NM1 and NM2 turn off, and output amplitude is little, thus realizes preemphasis.
5. the amplitude of oscillation with preemphasis equilibrium according to claim 1 adjustable SST type data transmitter, it is characterized in that, the intensity A of the preemphasis of described SST type data transmitter is inversely proportional to (M-P), wherein M is the number of enable SST unit, P is that in function selecting module, Input Control Word is the number of the unit of 11, and the size of adjustment P can change preemphasis.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520822928.8U CN205005038U (en) | 2015-10-22 | 2015-10-22 | Amplitude of oscillation adjustable SST type data transmitter with pre -emphasis is balanced |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520822928.8U CN205005038U (en) | 2015-10-22 | 2015-10-22 | Amplitude of oscillation adjustable SST type data transmitter with pre -emphasis is balanced |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105262475A (en) * | 2015-10-22 | 2016-01-20 | 北京大学 | Swing adjustable SST-type data transmitter with pre-emphasis equalization |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105262475A (en) * | 2015-10-22 | 2016-01-20 | 北京大学 | Swing adjustable SST-type data transmitter with pre-emphasis equalization |
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