Abstract:
The inventive amplifier stage calibration comprises the following steps: creating conditions that are suitable for calibrating the amplifier stage; comparing signals output by the amplifier stage or comparing electrical quantities occurring inside the amplifier stage with one another or with assigned reference values, and; modifying the attributes of the amplifier stage based on the result of the comparison. The described compensation of errors in amplifier stages of series-connected components is effected by correspondingly calibrating the amplifier stage. The inventive devices and methods enable the calibration of amplifier stages and the compensation for errors in amplifier stages of series-connected components to be carried out rapidly and precisely in an astonishingly simple manner.
Abstract:
The invention relates to a multiphase comparator, comprising a first difference stage (2) and a regeneration stage (4A,4B), whereby the first difference stage (2) amplifies an input signal in a first clock phase and supplies the same to a load element (5A) and the regeneration stage (4A) further amplifies the input signal. According to the invention, the effective comparison phase may be increased, whereby a first switching arrangement (3), which can selectively connect the output (AM,AP) from the first difference stage (2) with the input (RMi,RPi) of several load circuits (5A,5B), at least two regeneration stages (4A,4B), which are connected to one of the load circuits (5A,5B) and the switch arrangement (3) and a clock-controlled, second switch arrangement (6) are provided in order to supply the at least two regeneration stages (4A,4B) with an operating current which can be switched on and off. The switches for the first and second switch arrangement (3,6) are controlled such that the regeneration stages (4A,4B) operate with a temporal displacement.
Abstract:
The invention relates to a current source circuit that is characterized in that it comprises a control device (T2', T11', T12', T6, IQ1, IQ2) which controls a component (T2) of the current source circuit which determines a variable of the current supplied by the current source circuit, and in that the component is controlled in accordance with the conditions that prevail in the unit that supplied by the current source circuit with current. The inventive circuit is thus capable of continuously supplying a constant current without any limitations to its applications.
Abstract:
An analog/digital converter circuit comprises an analog/digital converter (1) and calibrating agents, preferably in the form of a digital logic, for the auto-calibration of the analog/digital converter (1). This configuration produces a very high quality analog/digital converter (1) with a very low surface area requirement. According to a first embodiment, the calibrating means (2-4) correct any error of the analog/digital converter (1) outside of said analog/digital converter (1). According to a second example of an embodiment, the correction is made inside the analog/digital converter.
Abstract:
A clock divider comprises a clock input (TE,PH1,PH2) and at least two clock outputs (T1,T2) to output signals of lower clock rate than the inputs. A circuit controls the energy supply so that the output circuit is only activated when needed depending on the input signal. An Independent claim is also included for a demultiplexer circuit having many outputs comprising the above.
Abstract:
A demultiplexer arrangement has several first demultiplexer stages (12) to which are supplied the scanning values of a correspondingly scanned signal (RX) with a corresponding scanning clock (11). Each of the demultiplexer stages (12) has at least one clock divider (13) and circuit devices (14,15) for outputting the respective supplied scanning values (10). At least one second demultiplexer stage (not shown here) receives the scanning values (QA,QB) outputted by the first stages (12) and combines them to a scanned word (SDQ). A phase correction device (not shown) receives the divided scanned clock-pulses (CLK,CLKB) of the first demultiplexer stage (12) and is designed so that the position of the scanning phases of the divided scanned clock-pulses to one another is ascertained and generates clock signals dependent on this position for the at least second demultiplexer stage. An Independent claim is included for a CDR- circuit arrangement for clock- and data-recovery.
Abstract:
The input stage of analog-to-digital converter includes differential amplifiers (DP11,DP12,DN13,DN14). First and second transistors (TP11,TP12) of at least one amplifier (DP11,DP12) are complementary to first and second transistors (TN11,TN12) of the other amplifier (DN13,DN14).
Abstract:
A folding stage of the convertor has means for sensitizing, inhibiting and enabling signal paths through the convertor such that in a first operating condition, first and second inputs to the stage are switched through to corresponding inputs of a differential amplifier (3) of the respective stage. In a second operating condition a low auxiliary potential is applied to the first input and a high auxiliary potential is applied to the second input. In a third condition a high auxiliary potential is applied to the first input and a low auxiliary potential is applied to the second input. In a fourth condition both inputs are set to a potential between the high and low potentials. Means (13) are also provided to set the amplifier outputs to the same potential in dependence on signals on a control bus (18). Means are also provided feed a signal from a comparator or differential amplifier via an interrogation bus (19) to a control unit (20). Independent claims also cover a self calibration method.
Abstract:
A CDR circuit arrangement, for example for a transceiver module, features a data recovery unit ( 4 ) for the recovery of the data contained in a received signal (DATA) by scanning this received data signal, and a phase evaluation unit for the determination of a suitable phase position for the scanning carried out by the data recovery unit ( 4 ). The phase evaluation unit comprises a scanning device ( 1 ) for the oversampling of a the received data signal (DATA) in accordance with several different scanning phases (P 0 -P 6 ), a phase detector device ( 2 ) for the evaluation of the scanning values (A 0 -A 6 ) accordingly prepared by the scanning device ( 1 ), in order thereby to derive intermediate signals (UP 1 -UP 3, DN 1 -DN 3 ), which classify the phase error during the scanning of the data signal by the scanning device ( 1 ) in respect of its size and direction of deviation, as well as a filter device ( 3 ), in order to subject the intermediate signals (UP 1 -UP 3, DN 1 -DN 3 ) generated by the phase detector device ( 2 ) to a weighted filtering process. In this situation, a setting signal (DeltaP) is generated by the filter device ( 3 ) for the subsequent regulation and control of the scanning phases (P 0 -P 6 ) of the scanning device ( 1 ).